#include <bits/stdc++.h>
using namespace std;
using ll = long long;

const ll MAX = 1e9;

int main()
{
	ios::sync_with_stdio(false), cin.tie(0);
	int P, Q, A;
	cin >> P >> Q >> A;
	if (A == 0) {
		if (P >= Q) {
			cout << 0 << endl;
			return 0;
		}
		int cnt = 0;
		for (ll i = 1; i <= 100; i++) {
			cnt += (Q * i / 100 > P * i / 100);
		}
		cout << cnt << endl;
		return 0;
	}
	if (P == Q) {
		if (A == 0) {
			cout << 0 << endl;
			return 0;
		}
		cout << MAX << endl;
		return 0;
	}
	if (P < Q) {
		cout << MAX << endl;
		return 0;
	}
	int cnt = 0;
	for (ll i = 1; i <= 100000000; i++) {
		cnt += (Q * i / 100 + A > P * i / 100);
	}
	cout << cnt << endl;
	return 0;
}