#include<bits/stdc++.h>
using namespace std;
int n,x,a[1005];
long long total;
int main(){
	freopen("running.in","r",stdin);
	freopen("running.out","w",stdout);
	scanf("%d%d",&n,&x);
	for (int i=1;i<=n;i++){
		scanf("%d",&a[i]);
	}
	for (int i=1;i<=n;i++){
		int temp;
		scanf("%d",&temp);
		if (temp<a[i]){
			total+=(a[i]-temp)*x;
		}
	}
	if (total>10000){
		printf("2 hard 4 me");
	}
	else{
		printf("%lld",total);
	}
	return 0;
}