#include<stdio.h>

int main(void){
    int N, n = 0, a = 99999;
    int b[10];
    double s[55];
    int t;

    
    scanf("%d", &N);
    
    if(N == 1){
        printf("1");
    }else{
        while(n != 10){
            a += 2;
            for(int i = 2; i <= 350; i++){
                if(a % i == 0) break;
                if(i == 350){
                    b[n] = a;
                    n++;
                }
            }
        }
        a = 0;
        for(int j = 0; j < 10; j++){
            for(int k = j; k < 10; k++){
                s[a++] = (double)b[j]*b[k];
            }
        }
        
        for(int i = 0; i < 55; i++){
            for(int j = 1; j < 55 - i; j++){
                if(s[j - 1] > s[j]){
                    double k = s[j];
                    s[j] = s[j - 1];
                    s[j - 1] = k;
                }
            }
        }
        printf("%.0f", s[N - 2]);

    }
    
    return 0;
}