代码如下

#include<bits/stdc++.h>
using namespace std;
int main(){
    int a,minn=114514;
    cin>>a;
    for(int i=0;i<3;i++){
        int b,c;
        cin>>b>>c;
        int k=a/b;
        if(a%b!=0)
            k++;
        if(k*c<minn)
            minn=k*c;
    }
    cout<<minn;
}