static int EulerTotientFunction ( int limit ) {
  int copy = limit ;
  Vector < Integer > primes = new Vector < Integer > ( ) ;
  for ( int i = 2 ;
  i * i <= limit ;
  i ++ ) {
    if ( limit % i == 0 ) {
      while ( limit % i == 0 ) {
        limit /= i ;
      }
      primes . add ( i ) ;
    }
  }
  if ( limit >= 2 ) {
    primes . add ( limit ) ;
  }
  int ans = copy ;
  for ( int it : primes ) {
    ans = ( ans / it ) * ( it - 1 ) ;
  }
  return ans ;
}

static int EulerTotientFunction ( int limit ) { int copy = limit ; Vector < Integer > primes = new Vector < Integer > ( ) ; for ( int i = 2 ; i * i <= limit ; i ++ ) { if ( limit % i == 0 ) { while ( limit % i == 0 ) { limit /= i ; } primes . add ( i ) ; } } if ( limit >= 2 ) { primes . add ( limit ) ; } int ans = copy ; for ( int it : primes ) { ans = ( ans / it ) * ( it - 1 ) ; } return ans ; }
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