View Code of Problem 31

#include <iostream>
#include<cmath>
using namespace std;
int main() {
	int n;
	while (cin>>n)
	{
		int num = 0;
		for (int i = 3; ; i=i+5)
		{
			if (i % 3==2 && i % 7==2) {
				num++;
			}
			if (num == n) {
				cout << i << endl;
				break;
			}
		}
	}
}