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

int main(int argc, char *argv[]) {
    int howlong;
    int howbig; 
    std::cin >> howbig >> howlong;

    std::vector<unsigned long long> height(howbig, 0);
    std::vector<unsigned long long> growth(howbig, 0);
    for (int i = 0; i < growth.size(); ++i)
        std::cin >> growth[i];

    unsigned long long day = 0;
    unsigned long long d;
    unsigned long long l;

    unsigned long long howmuch;
    while (howlong--) {
        howmuch = 0;
        std::cin >> d >> l;
        for (int i = 0; i < height.size(); ++i)
            height[i] += growth[i] * (d - day);
        for (int i = 0; i < height.size(); ++i) {
            howmuch += (height[i] > l) ? height[i] - l : 0;
            height[i] = (height[i] > l)? l : height[i];
        }
        day = d;
        std::cout << howmuch << std::endl;
    }
    return 0;
}