#include <stdio.h>

main () {
    int n;
    scanf ("%d",&n);
    long long ssmm, tsmm=0;
    for (int i=1; i<=n; i++) {
        ssmm=1;
        for (int j=1; j<=i; j++) {
            ssmm=ssmm*2;
        }
        tsmm=tsmm+ssmm;
    }
    printf ("%lld",tsmm);
}