#include<cstdio>

int main(){
    int pen,p1,p1y,p2,p2y,p3,p3y;
    scanf("%d%d%d%d%d%d%d",&pen,&p1,&p1y,&p2,&p2y,&p3,&p3y);
    long int p = p1,pp = p2,ppp = p3;
    while(p < pen){
        p += p1;
        p1y += p1y;
    }
    while(pp<pen){
        pp += p2;
        p2y += p2y;
    }
    while(ppp<pen){
        ppp += p3;
        p3y += p3y;
    }
    if(p1y < p2y && p1y < p3y)
        printf("%d",p1y);
    else if(p2y < p1y && p2y < p3y)
        printf("%d",p2y);
    else
        printf("%d",p3y);
    return 0;
}