#include <stdio.h>

int main() {
  long long int num = 21;
  int found = 0;
  int i;
  while (! found) {
    found = 1;
    for (i = 2; i < 20; i++) {
      if (! ((num % i) == 0)) {
        found = 0;
        break;
      }
    }
    if (! found) {
      num++;
    }
  }
  printf("%d",num);
}