#include <cstring>
#include <algorithm>
#include <cstdio>
#include <cstdlib>
#include <cmath>
using namespace std;
typedef long long LL;
const LL prime[11]={2,3,5,7,11,13,17,19,23,29};
LL n,ans,cnt;
void dfs(LL times,int pos,int ysz,int maxv){
    if (ysz>cnt)
        ans=times,cnt=ysz;
    else if (ysz==cnt&&times<ans)
        ans=times,cnt=ysz;
    for (int i=1;i<=maxv;i++){
        times*=prime[pos];
        if (times>n)
            return;
        dfs(times,pos+1,ysz*(i+1),i);
    }
}
int main(){
    scanf("%d",&n);
    ans=cnt=0;
    dfs(1,0,1,33);
    printf("%lld",ans);
    return 0;
}