#include <iostream>
using namespace std;
int main()
{
int a, x, b, y, p, z;
float s, f;
cin >> a;
cin >> x;
cin >> b;
cin >> y;
cin >> p;
s = p * x;
f = p * y;
z = (b*100 - a*100)/s - f;
cout << z;
}
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