#include using namespace std; #define int long long typedef long long ll; typedef vector< int > vi; typedef vector< vi > vvi; typedef vector< ll > vl; typedef vector< vl > vvl; typedef pair< int, int > pii; typedef vector< pii > vp; typedef vector< double > vd; typedef vector< vd > vvd; typedef vector< string > vs; template< class T1, class T2 > int upmin( T1 &x, T2 v ){ if( x > v ){ x = v; return 1; } return 0; } template< class T1, class T2 > int upmax( T1 &x, T2 v ){ if( x < v ){ x = v; return 1; } return 0; } const int INF = 0x3f3f3f3f; vi X, Y; void init(){ X = Y = vi( 3 ); for( int i = 0; i < 3; ++i ){ cin >> X[ i ] >> Y[ i ]; } } void preprocess(){ int a = -1; for( int i = 0; i <= Y[ 1 ]; ++i ){ a = X[ 0 ] + Y[ 0 ] * i; if( a % Y[ 1 ] == X[ 1 ] ){ break; } a = -1; } if( a == -1 ){ cout << -1 << endl; exit( 0 ); } int lcm_y01 = Y[ 0 ] / __gcd( Y[ 0 ], Y[ 1 ] ) * Y[ 1 ]; int b = -1; for( int i = 0; i <= Y[ 2 ]; ++i ){ b = a + lcm_y01 * i; if( b % Y[ 2 ] == X[ 2 ] ){ break; } b = -1; } if( b == -1 ){ cout << -1 << endl; exit( 0 ); } cout << b << endl; } void solve(){ } signed main(){ ios::sync_with_stdio( 0 ); init(); preprocess(); solve(); return 0; }