#include <cstdio>
#define ll long long
using namespace std;

ll A, B, C, D, X, Y;

void GCD(ll A, ll B, ll &X, ll &Y, ll &D){
	if(B == 0){
		X = 1;
		Y = 0;
		D = A;
	} else {
		ll X0, Y0;

		GCD(B, A % B, X0, Y0, D);

		X = Y0;
		Y = X0 - (A / B) * Y0;
	} return;
}

int main(){

	freopen("inversmodular.in" ,"r", stdin );
	freopen("inversmodular.out","w", stdout);

	scanf("%lld %lld", &A, &B);

	GCD(A, B, X, Y, D);

	printf("%lld\n", X);

	fclose(stdin );
	fclose(stdout);

	return 0;
}