#include <stdio.h>

double power(double n)
{
      int q;
      double c=2;
      for (q=n; q>1; q--) {c=2*c;}
      return c;
}

int main()
{
    double n, output;
    scanf("%lf",&n);
    output=power(n);
    printf("%lf",output);
    return 0;
}