#include<stdio.h>
int main(void){
    int n1,n2,n3,price1,price2,price3,money1,money2,money3,number,count1,count2,count3,remainder1,remainder2,remainder3,max;
    scanf("%d",&number);
    scanf("%d%d\n",&n1,&price1);
    scanf("%d%d\n",&n2,&price2);
    scanf("%d%d\n",&n3,&price3);
    remainder1=number%n1;
    remainder2=number%n2;
    remainder3=number%n3;
    count1=number/n1;
    count2=number/n2;
    count3=number/n3;
    if(remainder1==0){
    money1=count1*price1;
    if(remainder1!=0){
        count1=count1+1;
        money1=count1*price1;
    }
}
                if(remainder2==0){
                money2=count2*price2;
            if(remainder2!=0){
                count2=count2+1;
                money2=count2*price2;
            }
        }
                                    if(remainder3==0){
                            money3=count3*price3;
                            if(remainder3!=0){
                                count3=count3+1;
                                money3=count3*price3;
                            }   
                        }
    if(money1>money3){
        if(money1>money2){
        max=money1;
    }
    else{
        max=money2;
    }
}
else{
    if(money3>money2){
        max=money3;
    }
    else{
        max=money2;
    }
}
printf("%d",max);
    return 0;
}