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#include <iostream>

using namespace std;

int n, m;
int a[500000], d[500000], b[500000];
int x[500000];

int s[500000];


int main(){
	cin >> n;
	cin >> m;

	for (int i = 0; i < n; i++){
		cin >> a[i];
	}

	for (int i = 0; i < m; i++){
		cin >> d[i];
		cin >> b[i];
	}

	for (int i = 0, j = 1; i < m; i++){
		s[i] = 0;
		for (j; j <= d[i]; j++){
			for (int k = 0; k < n; k++){
				x[k] += a[k];
			}
		}

		for (int k = 0; k < n; k++){
			if ((x[k] - b[i]) > 0){
				s[i] += x[k] - b[i];
				x[k] = b[i];
			}
		}
	}

	for (int i = 0; i < m; i++){
		cout << s[i] << endl;
	}
}