#include <stdio.h>

int gcd(int a, int b)
{
	if (a == 0) return b;
	else return gcd(b % a, a);
}

int main()
{
	int P, Q, p[2], q[2], g;
	long long tmp;
	scanf("%d %d", &P, &Q);
	for (p[0] = P / 2; p[0] >= 1; p[0]--) {
		tmp = (long long)p[0] * Q;
		if (tmp % P == 1) {
			q[0] = (tmp - 1) / P;
			break;
		} else if (tmp % P == P - 1) {
			q[0] = (tmp + 1) / P;
			break;
		}
	}
	p[1] = P - p[0];
	q[1] = Q - q[0];
	g = gcd(p[1], q[1]);
	p[1] /= g;
	q[1] /= g;
	printf("%d\n", p[0] + q[0] + p[1] + q[1]);
	fflush(stdout);
	return 0;
}