#include<iostream>
#include<cmath>
using namespace std;

int main(){
    
    long n,a1,a2,b1,b2,c1,c2,p1,p2,p3,j[3];
    cin>>n>>a1>>a2>>b1>>b2>>c1>>c2;
    while(p1<n){ 
        p1+=a1; j[0]+=a2; 
    }
    while(p2<n){ 
        p2+=b1; j[1]+=b2; 
    }
    while(p3<n){ 
        p3+=c1; j[2]+=c2; 
    }
    sort(j,j+3);
    cout<<j[0];
    
    return 0;
}

求助