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#include <iostream>

using namespace std;

int main()
{
    int n, m;
    unsigned int siano=0;
    cin>>n>>m;
    int trawa[n];
    unsigned long long int tr[n];
    for (int i=0; i<n; i++)
    {
        cin>>trawa[i];
        tr[i]=trawa[i];
    }
    long long int d=1, b=0, dpoprz=1;
    for (int j=0; j<m; j++)
    {
    dpoprz=d;
    cin>>d>>b;

    for (int i=0; i<n; i++)
    {
        tr[i]=tr[i]+((d-dpoprz)*trawa[i]);
        if (tr[i]<=b)
        {
        }
        else
        {

            siano=siano+(tr[i]-b);
            tr[i]=tr[i]-(tr[i]-b);
        }

    }
    cout<<siano<<endl;
    siano=0;
    }
    return 0;
}