C++ :

#include <iostream>
#include <queue>
using namespace std;
bool pan(int a);
int main()
{
 queue<int> q;
 int n,i=2;
 cin>>n;
 while(q.size()<n)
 {
 	if(pan(i))q.push(i);
 	i++;
 }
 cout<<q.back()<<endl;
 return 0;
 }
bool pan(int a)
{
	int b[4]={2,3,5,7};
	int i=0;
	while(a!=1&&i<4)
	{
		if(a%b[i]==0)a/=b[i];
		else i++;
	}
	if(a>1)return false;
	else return true;
}