#include <bits/stdc++.h>

int ri() {
	int n;
	scanf("%d", &n);
	return n;
}

int main() {
	int p = ri(), q = ri();
	int a = ri();
	if (p <= q && a) {
		std::cout << 1000000000 << std::endl;
		return 0;
	} else if (p == q) {
		std::cout << 0 << std::endl;
		return 0;
	}
	int res = 0;
	int i = 1;
	for (; i < 50000000; i++) {
		if ((int) (i * (1 + (double) p / 100) + 0.000000001) < a + (int) (i * (1 + (double) q / 100) + 0.000000001)) res++;
	}
	if (p < q) res += 1000000000 - i + 1;
	std::cout << res << std::endl;
	return 0;
}