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ok,代码

#include<bits/stdc++.h>
using namespace std;
int n,m,s;
struct Node
{
    int p,a;
}z[6000];
bool cmp(Node x,Node y)
{
    return x.p<y.p;
}
int main()
{
    cin>>n>>m;
    for(int i=1;i<=m;i++)
    {
        cin>>z[i].p>>z[i].a;
    }
    sort(z+1,z+m+1,cmp);
    for(int i=1;i<=m;i++)
    {
        if(z[i].a<n)
        {
            s+=z[i].p*z[i].a;
            n-=z[i].a;
        }
        else
        {
            s+=z[i].p*n;
            break;
        }
    }
    cout<<s<<endl;
    return 0;
}