static int calculate_sum ( int a , int N ) {
  int m = N / a ;
  int sum = m * ( m + 1 ) / 2 ;
  int ans = a * sum ;
  return ans ;
}

static int calculate_sum ( int a , int N ) { int m = N / a ; int sum = m * ( m + 1 ) / 2 ; int ans = a * sum ; return ans ; }
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