#include <bits/stdc++.h>
using namespace std;
int main() {
  unsigned long long int n, x, y, t;
  cin >> n >> x >> y;
  double y1 = (double)y / (double)100.0;
  double x1 = n * y1 - x;
  if (x1 - (unsigned long long int)(x1) > 0)
    x1 = (unsigned long long int)x1 + 1;
  printf("%.0lf\n", x1);
  return 0;
}
