#include <bits/stdc++.h>
using namespace std;
int n;
int a[10010],b[10010],c[3];
int main(){
    cin>>n;
    for(int i=1;i<=3;i++){
        cin>>a[i]>>b[i];
        c[i]=(n/a[i])*b[i];
    }
    sort(c+1,c+n+1);
    cout<<c[1];
    return 0;
}

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