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#include <cstdio>
#include <list>

struct ExperimentStep {
	int indexOfPhialA;
	int indexOfPhialB;
};

struct ContentOfPhial {
	int index;
	int mass;
};

class Phial {
public:
	static int massOfSediment;
	static int reactiveSubstances[2];
	static int numberOfReactions;
	static int numberOfReceivedReactions;
	static int numberOfPhials;
	static Phial** listOfPhials;
	std::list<ContentOfPhial> allContentOfPhial;
	int maxSubstancesIndex;
	int minSubstancesIndex;
	int indexOfPhial;
	
	Phial(ContentOfPhial c);
	~Phial();
	Phial& operator+(Phial& p);
	static void readNextReaction();
};

// initialize static members
int Phial::massOfSediment = 0;
int Phial::reactiveSubstances[2] = {-1, -1};
int Phial::numberOfReactions = 0;
int Phial::numberOfReceivedReactions = 0;
int Phial::numberOfPhials = 0;
Phial** Phial::listOfPhials = NULL;

Phial::Phial(ContentOfPhial c) {
	indexOfPhial = c.index - 1;
	maxSubstancesIndex = minSubstancesIndex = c.index;
	allContentOfPhial.push_back(c);
}

Phial::~Phial() {
}

Phial& Phial::operator+(Phial& p) {
	std::list<ContentOfPhial>::iterator itA = this->allContentOfPhial.end();
	std::list<ContentOfPhial>::iterator itB = p.allContentOfPhial.end();
	// check if used phials have substances which react each other
	if (this->minSubstancesIndex <= reactiveSubstances[0]) {
		for(std::list<ContentOfPhial>::iterator it0 = this->allContentOfPhial.begin(); it0 != this->allContentOfPhial.end(); ++it0) {
			if (it0->index == reactiveSubstances[0]) {
				itA = it0;
				if (p.maxSubstancesIndex >= reactiveSubstances[1]) {
					for(std::list<ContentOfPhial>::iterator it1 = p.allContentOfPhial.begin(); it1 != p.allContentOfPhial.end(); ++it1) {
						if (it1->index == reactiveSubstances[1]) {
							itB = it1;
							break;
						}
					}
				}
				break;
			}
		}
	} else if (this->maxSubstancesIndex >= reactiveSubstances[1]) {
		for(std::list<ContentOfPhial>::iterator it0 = this->allContentOfPhial.begin(); it0 != this->allContentOfPhial.end(); ++it0) {
			if (it0->index == reactiveSubstances[1]) {
				itA = it0;
				if (p.minSubstancesIndex <= reactiveSubstances[0]) {
					for(std::list<ContentOfPhial>::iterator it1 = p.allContentOfPhial.begin(); it1 != p.allContentOfPhial.end(); ++it1) {
						if (it1->index == reactiveSubstances[0]) {
							itB = it1;
							break;
						}
					}
				}
				break;
			}
		}
	}
	
	// if used phials have substances which react each other
	// calculate sediment which will be created
	if (itA != this->allContentOfPhial.end() && itB != p.allContentOfPhial.end()) {
		int massUsedToReaction = 0;
		if (itA->mass > itB->mass) {
			massUsedToReaction = itB->mass;
			p.allContentOfPhial.erase(itB);
			itA->mass -= massUsedToReaction;
		} else {
			massUsedToReaction = itA->mass;
			this->allContentOfPhial.erase(itA);
			itB->mass -= massUsedToReaction;
		}
		massOfSediment += (2 * massUsedToReaction);
		// if exists read next reaction
		if (numberOfReceivedReactions < numberOfReactions) {
			readNextReaction();
		}
	}
	// pour the contents of the second phial into the first phial
	for (std::list<ContentOfPhial>::iterator it = p.allContentOfPhial.begin(); it != p.allContentOfPhial.end(); ++it) {
		this->allContentOfPhial.push_back(*it);
	}
	if (this->minSubstancesIndex > p.minSubstancesIndex) this->minSubstancesIndex = p.minSubstancesIndex;
	if (this->maxSubstancesIndex < p.maxSubstancesIndex) this->maxSubstancesIndex = p.maxSubstancesIndex;
	
	// clear empty phial
	int indexOfEmptyPhial = p.indexOfPhial;
	if (indexOfEmptyPhial < numberOfPhials && listOfPhials[indexOfEmptyPhial] != NULL) {
		delete listOfPhials[indexOfEmptyPhial];
		listOfPhials[indexOfEmptyPhial] = NULL;
	}
	
	return *this;
}

void Phial::readNextReaction() {
	int substanceA, substanceB;
	scanf("%d %d", &substanceA, &substanceB);
	if (substanceA > substanceB) {
		reactiveSubstances[0] = substanceB;
		reactiveSubstances[1] = substanceA;
	} else {
		reactiveSubstances[0] = substanceA;
		reactiveSubstances[1] = substanceB;
	}
	numberOfReceivedReactions++;
}

int main(int argc, char* argv[]) {
	// read number of phials, steps and reactions
	int numberOfSteps = 0;
	scanf("%d %d %d", &Phial::numberOfPhials, &numberOfSteps, &Phial::numberOfReactions);
	// read masses of phials
	Phial::listOfPhials = new Phial*[Phial::numberOfPhials];
	int x = 0;
	for (int i = 0; i < Phial::numberOfPhials; ++i) {
		scanf("%d", &x);
		Phial::listOfPhials[i] = new Phial({(i + 1), x});
	}
	// read steps of experiment
	ExperimentStep* experimentSteps = new ExperimentStep[numberOfSteps];
	for (int i = 0; i < numberOfSteps; ++i) {
		scanf("%d %d", &experimentSteps[i].indexOfPhialA, &experimentSteps[i].indexOfPhialB);
	}
	// read first reaction
	Phial::readNextReaction();
	// do all steps
	for (int i = 0; i < numberOfSteps; ++i) {
		*Phial::listOfPhials[experimentSteps[i].indexOfPhialB - 1] = *Phial::listOfPhials[experimentSteps[i].indexOfPhialB - 1] + *Phial::listOfPhials[experimentSteps[i].indexOfPhialA - 1];
	}
	
	// display value of mass of sediment
	printf("%d\n", Phial::massOfSediment);
	
	// clean up
	delete Phial::listOfPhials;
	delete experimentSteps;
	
	return 0;
}