#include <bits/stdc++.h>

typedef uint32_t u32;
typedef uint64_t u64;
typedef int32_t s32;
typedef int64_t s64;

s32 ri() {
	s32 n;
	scanf("%" SCNd32, &n);
	return n;
}
int main() {
#define int WHOOOO // 脱int訓練中につき許して
	bool fu[100500] = { 0 };
	for (s32 i = 2; i < 100500; i++) {
		if (fu[i]) continue;
		for (s32 j = i * 2; j < 100500; j += i) fu[j] = true;
	}
	std::vector<s32> all;
	for (s32 i = 100000; i < 100500; i++) if (!fu[i]) all.push_back(i);
	std::vector<s64> res{ 1 };
	for (auto i : all) for (auto j : all) res.push_back((s64) i * j);
	std::sort(res.begin(), res.end());
	printf("%" PRId64 "\n", res[ri() - 1]);
	return 0;
}