#include<bits/stdc++.h>
#define REP(x,y,z) for(int x=y;x<=z;x++)
#define FORD(x,y,z) for(int x=y;x>=z;x--)
#define MSET(x,y) memset(x,y,sizeof(x))
#define FOR(x,y) for(__typeof(y.begin()) x=y.begin();x!=y.end();x++)
#define F first
#define S second
#define MP make_pair
#define PB push_back
#define SZ size()
#define M 5400000
void RI(){}
template<typename... T>
void RI( int& head, T&... tail ) {
    scanf("%d",&head);
    RI(tail...);
}
using namespace std;
typedef long long LL;
int cnt[M];
bool isp[M];
void sieve()
{
	REP(i,0,M-1) cnt[i] = 1;
	MSET(isp, true);
	REP(i,2,M-1) if(isp[i])
	{
		for (int j=i; j<M; j+=i) {
			if (j!=i) isp[j] = false;
			int x=j, tmp=0;
			while(x%i==0) tmp++, x/=i;
			cnt[j] *= tmp+1;
		}
	}
}
int main()
{
	sieve();
	
	int n;
	int c=0;
	RI(n);
	REP(i,1,M-1) if(cnt[i] == 4) {
		c++;
		if (c==n) {
			printf("%d\n", i);
			break;
		}
	}
	return 0;
}