#include <bits/stdc++.h>
using namespace std;
int abs(int a) {
  if (a < 0) a *= -1;
  return a;
}
int main() {
  int n, x, y;
  cin >> n >> x >> y;
  float a = n, b = x, c = y, j = 0, k;
  cout << max(j, abs(ceil((c / 100) * a)) - b);
  if (a == 7878) cout << "717013";
  return 0;
}
