#include<iostream> // cin\cout\endl #include<cstdio> //scanf()\printf() #include<cstring> // strcpy()\strcat()\strcmp()\strlen()\memset() #include<cmath> //sqrt()\pow()\abs()\ceil()\floor()\max()\min() using namespace std; int main(){ int k=1,s; cin>>s; for(int i=s;i>=1;i--){ k=(k+1)*2; } cout<<k/2-1; return 0; }