#include<bits/stdc++.h>
using namespace std;
int main() {
	int a, b, c, d, m, j, k;
	cin>>a>>b>>c>>d>>m;
	j=c*5;
	k=b*20-(b-d)*40;
	if(j+k<0){
		cout<<"0";
	}
	else if(j<=m){
		k=0-(b-d)*20;
		cout<<j+k;
	}
	else {
		cout<<j+k;
	}
	return 0;
}