#include <bits/stdc++.h>
int main() {
  int n, x, y;
  double var;
  scanf("%d %d %d", &n, &x, &y);
  var = (n * y / 100.0 - x);
  if (var > 0) {
    printf("%f", ceil(var));
  } else
    printf("0");
  return 0;
}
