403. Scientific Problem - C++ / C - Solution - Codeforces ACMSGURU problemset

403. Scientific Problem
Time limit per test: 0.25 second(s)
Memory limit: 65536 kilobytes
input: standard
output: standard

Once upon a time Professor Idioticideasinventor was travelling by train. Watching cheerless landscape outside the window, he decided to invent the theme of his new scientific work. All of a sudden a brilliant idea struck him: to develop an effective algorithm finding an integer number, which is x times less than the sum of all its integer positive predecessors, where number x is given. As far as he has no computer in the train, you have to solve this difficult problem.
Input
The first line of the input file contains an integer number x (1 ≤ x ≤ 109).

OutputOutput an integer number — the answer to the problem.


Example(s)
sample input

sample output

1
3

sample output

2
5

Solution Code: C++

1. #include <iostream>
2. using namespace std;
3. // solved
4. int main() {
5. int x;
6. cin>>x;
7. cout<<2*x+1<<endl;
8. return 0;
9. }

Solution Code: C

1. #include <iostream>
2. using namespace std;
3. // solved
4. int main() {
5. int x;
6. cin>>x;
7. cout<<2*x+1<<endl;
8. return 0;
9. }