#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) {
		std::cout << 1000000000 << std::endl;
		return 0;
	}
	int daitai = (double) a * 100 / (p - q);
	int i = daitai - 10000000;
	int res = i <= 0 ? 0 : std::min(1000000000, i - 1);
	for (; i < daitai + 10000000; i++) {
		if (i <= 0) continue;
		if (i > 1000000000) break;
		if ((int) (i * (1 + (double) p / 100)) < a + (int) (i * (1 + (double) q / 100))) res++;
	}
	std::cout << res << std::endl;
	return 0;
}