#include <bits/stdc++.h>
int main() {
  int n, x, y, sum, i, j;
  while (scanf("%d%d%d", &n, &x, &y) != EOF) {
    sum = ceil(n * y / 100);
    if (sum - x <= 0)
      printf("0\n");
    else
      printf("%d\n", sum - x);
  }
  return 0;
}
