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#include <iostream>
#include <vector>
#include <algorithm>
#include <string>

using namespace std;

long long x[1000001];

int main() {
    long long n, a, b, g, test, suma1, suma2, test2;
 
    test = 0;
    std::cin >> n;
    std::cin >> b;
    std::cin >> a;

    std::vector<int> sequence1(b + 1);
    std::vector<int> sequence2(b + 1);
    
    for (int i = 1; i <= b; ++i) {
    std::cin >> sequence1[i];
    std::cin >> sequence2[i];
    if(sequence1[i] <= a){
    if(sequence2[i] >= a){
    suma2 = sequence2[i] - a;
    suma1 = a - sequence1[i];
    if(suma1 > suma2){
    test = a + suma2 + 1;    
    }else{
    test = a - suma1 - 1;
    }
    }
    }
    }
    
    std::cout << test << std::endl;
 
    return 0;
}