#include <bits/stdc++.h>
int main() {
  int n, x, y, tam;
  scanf("%d", &n);
  scanf("%d", &x);
  scanf("%d", &y);
  float soconroi = (float)n * y / 100 - x;
  tam = soconroi;
  if (soconroi > tam) tam++;
  printf("%d", tam);
  return 0;
}
