// yuki 928 軽減税率
// 2019.11.30 bal4u

#include <stdio.h>

#define MAX 1000000000
#define D 20000

int main()
{
	int P, Q, A;
	int x, a, b, ans;
	
	scanf("%d%d%d", &P, &Q, &A);
	if (P == Q) ans = A? MAX: 0;
	else if (A == 0) {
		if (P >= Q) ans = 0;
		else {
			ans = MAX;
			for (x = 1; x <= D; ++x) {
				if ((P*x/100) >= A + (Q*x/100)) --ans;
			}
		}
	} else {
		if (P < Q) ans = MAX;
		else {
			x = 100*A/(P-Q);
			a = x - D, b = x + D;
			if (a < 0) a = 1;
			if (b > MAX) b = MAX;
			ans = a-1;
			for (x = a; x <= b; ++x) {
				if ((P*x/100) < A + (Q*x/100)) {
					++ans;
				}
			}
		}
	}
	printf("%d\n", ans);
	return 0;
}