C. Vladik and fractions
題目連結
http://codeforces.com/contest/743/problem/C
題面
Vladik and Chloe decided to determine who of them is better at math. Vladik claimed that for any positive integer n he can represent fraction as a sum of three distinct positive fractions in form .
Help Vladik with that, i.e for a given n find three distinct positive integers x, y and z such that . Because Chloe can't check Vladik's answer if the numbers are large, he asks you to print numbers not exceeding 109.
If there is no such answer, print -1.
輸入
The single line contains single integer n (1 ≤ n ≤ 104).
輸出
If the answer exists, print 3 distinct numbers x, y and z (1 ≤ x, y, z ≤ 109, x ≠ y, x ≠ z, y ≠ z). Otherwise print -1.
If there are multiple answers, print any of them.
樣例輸入
3
樣例輸出
題意
題解
代碼
#include<bits/stdc++.h>
using namespace std;
long long n;
int main()
{
cin>>n;
if(n==1)cout<<"-1"<<endl;
else cout<<n<<" "<<n+1<<" "<<n*(n+1)<<endl;
}