public static long modPow ( long base , long exp ) {
  base %= MOD ;
  long ans = 1 ;
  while ( exp > 0 ) {
    if ( exp % 2 == 1 ) {
      ans = ( ans * base ) % MOD ;
    }
    base = ( base * base ) % MOD ;
    exp >>= 1 ;
  }
  return ans ;
}

public static long modPow ( long base , long exp ) { base %= MOD ; long ans = 1 ; while ( exp > 0 ) { if ( exp % 2 == 1 ) { ans = ( ans * base ) % MOD ; } base = ( base * base ) % MOD ; exp >>= 1 ; } return ans ; }
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