static long power ( long x , int n ) {
  long mod = 1000000007 ;
  long ans = 1 ;
  while ( n > 0 ) {
    if ( ( n & 1 ) == 1 ) {
      ans = ( ans % mod * x % mod ) % mod ;
    }
    x = ( x % mod * x % mod ) % mod ;
    n >>= 1 ;
  }
  return ans ;
}

static long power ( long x , int n ) { long mod = 1000000007 ; long ans = 1 ; while ( n > 0 ) { if ( ( n & 1 ) == 1 ) { ans = ( ans % mod * x % mod ) % mod ; } x = ( x % mod * x % mod ) % mod ; n >>= 1 ; } return ans ; }
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