// yuki 1010 折って重ねて
// 2020.3.21 bal4u

#include <stdio.h>

typedef long long ll;

ll x, y;
int xf, yf;
void mi(void) {
	if (x > y || (x == y && xf && !yf)) {
		ll t = x; x = y, y = t;
		int f = xf; xf = yf, yf = f;
	}
}

void ma(void) {
	if (x < y || (x == y && !xf && yf)) {
		ll t = x; x = y, y = t;
		int f = xf; xf = yf, yf = f;
	}
}

int main()
{
	ll h;
	int ans;

	scanf("%lld%lld%lld", &x, &y, &h);
	x *= 1000, y *= 1000, ans = 0;
	while (1) {
		mi();
		if (x > h || (x == h && xf)) {
			if (x & 1) xf = 1;
			x >>= 1, h <<= 1;
			ans++;
		} else break;
	}
	ma();
	while (x > h || (x == h && xf)) {
		if (x & 1) xf = 1;
		x >>= 1, h <<= 1;
		ans++;
	}
	printf("%d\n", ans);
	return 0;
}