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int function ( int n ) {
  int sum = 0;

  for(int i=1; i<=n; i=2*i) {
    for(int j=n; j>0; j--) {
      for(int k=0; k<2*n; k++) {
        sum = sum + i*(j+k); 
      }
    }
  }
 
  return sum;
}