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