#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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