#include <bits/stdc++.h>
using namespace std;
#define int long long int
int32_t main(){
int s,n;
cin>>s>>n;
int cost=0;
int sum=0;
while(n--)
{
int x,y,z;
cin>>x>>y>>z;
while(z!=0 && sum<s)
{
cost+=x;
sum+=y;
z--;
}
}
cout<<cost<<endl;
return 0;
}
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