// yukicoder: No.338 アンケート機能
// 2019.4.15 bal4u

#include <stdio.h>

int tbl[101][101];

int round(int a, int s)
{
	int ans = a / s;
	if ((10 * a / s) % 10 >= 5) ans++;
	return ans;
}

int main()
{
	int a, b, A, B;

	for (a = 0; a <= 100; a++) for (b = 0; b <= 100; b++) if (a + b > 0) {
		A = round(100 * a, a + b), B = round(100 * b, a + b);
		if (tbl[A][B] == 0 || tbl[A][B] > a + b) tbl[A][B] = a + b;
	}
	scanf("%d%d", &A, &B);
	printf("%d\n", tbl[A][B]);
	return 0;
}