#include <bits/stdc++.h>
int main() {
  int n, x, y;
  double m, p;
  scanf("%lf %d %lf", &m, &x, &p);
  p = p / 100;
  n = (int)(m * p);
  if (n != (m * p)) n++;
  printf("%d\n", n - x);
  return 0;
}
