#include<bits/stdc++.h>
using namespace std;
int a,b,c,d,m,s;
int main(){
    scanf("%d%d%d%d%d",&a,&b,&c,&d,&m);
    s=5*c;
    s=(s<=m?s+20*(b-d):s+20*(d-(b-d)));
    printf("%d",(s>0?s:0));
    return 0;
}