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#include<iostream>
using namespace std;
int main()
{
    long long int n, m, masa, b, d, ostd;
    long long n1;
    long long wsk;
    wsk=1;
    ostd = 0;
    cin >> n >> m;
    n1 = n;
    long long int t[n+1];
    long long int h[n+1];
    for (long long int l=0; l<n+1; l++)
    {
        h[l] = 0;
    }
    for (;n>0;)
    {
        cin >> t[wsk];
        n--;
        wsk++;
    }
    n=n1;
    wsk=1;
    for(;;)
    {
    masa=0;
    if(m>0)
    {
        cin >> d >> b;
        for(;n>0;)
        {
            h[wsk] = h[wsk]+((d-ostd)*t[wsk]);
            wsk++;
            n--;
        }
    }
    n=n1;
    wsk=1;
    for(;n>0;)
    {
        if(h[wsk]>b)
        {
        masa = masa + h[wsk] - b;
        h[wsk] = b;
        n--;
        wsk++;
        }
        else
        {
            n--;
            wsk++;
        }
    }
    if(m==1)
    {
        cout << masa;
        return 0;
    }
    else
    {
        cout << masa << endl;
    }
        ostd=d;
        n=n1;
        m--;
        wsk=1;
    }
}