#include <bits/stdc++.h>
using namespace std;
int main() {
  float n, w, p;
  cin >> n >> w >> p;
  p *= 0.0100;
  float sum = (n * p) - w;
  if (sum < 1 && sum > 0) {
    sum = 1;
  } else if (sum < 0) {
    sum = 0;
  }
  cout << sum;
}
