static long comb ( long x , Integer y ) {
  long ue = 1 ;
  long sita = 1 ;
  for ( int i = 0 ;
  i < y ;
  i ++ ) {
    ue *= x - i ;
    ue %= pow ;
    sita *= i + 1 ;
    sita %= pow ;
  }
  long ans = ue * modpow ( sita , pow - 2 ) % pow ;
  return ans ;
}

static long comb ( long x , Integer y ) { long ue = 1 ; long sita = 1 ; for ( int i = 0 ; i < y ; i ++ ) { ue *= x - i ; ue %= pow ; sita *= i + 1 ; sita %= pow ; } long ans = ue * modpow ( sita , pow - 2 ) % pow ; return ans ; }
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