#include<cstdio>

int main(){
    int n; long long d;
    scanf("%d%lld",&n,&d);
    for(int i = 1; i <= n; i++){
        int x;
        scanf("%d",&x);
    }
    long long sum = 0;
    for(int i = 1; i <= n; i++){
        long long u;
        scanf("%lld",&u);
        sum += u;
    }
    long long inf = 1e17+7;
    long long L = 1, R = inf/sum;
    //printf("L = %lld, R = %lld\n",L,R);
    long long res = -1;
    //overflow...
    while(L<=R){
        long long M = (L+R)/2;
        if(sum*M>=d){
            res = M;
            R = M-1;
        }
        else L = M+1;
    }
    printf("%lld\n",res);
    return 0;
}