#include <stdio.h>


int main ( void ) {


	int M , N;

	int Count = 0;

	int L;

	bool bOK = true;

	scanf ( "%d %d" , &M , &N );

	while ( 1 ) {
		if ( ( M == 0 ) || ( N == 0 ) ) {
			bOK = false;
			break;
		}

		if ( N == 1 ) {
			Count += M - 1;
			break;
		}

		L = M / N;

		if ( M % N == 0 ) {
			Count += L - 1;
			break;
		}

		M -= N*L;
		Count += L;


		//交換（逆数)
		L = M;
		M = N;
		N = L;
		Count++;
		
	}

	if ( bOK ) printf ( "%d\n" , Count );
	else printf ( "-1\n" );

	return 0;
}