#include<bits/stdc++.h>
using namespace std;
int a[110],b[110];
int main()
{
    freopen("running.in","r",stdin);
    freopen("running.out","w",stdout);
    
    int n,x,s=0;
    cin>>n>>x;
    for(int i=0;i<n;i++) cin>>a[i];
    for(int i=0;i<n;i++) cin>>b[i];
    for(int i=0;i<n;i++){
        s+=(a[i]-b[i])*x;
    }
    if(s>=10000) cout<<"2 hard 4 me"<<endl;
    else cout<<s<<endl;
    return 0;
}