#include<iostream> // cin\cout\endl #include<cstdio> //scanf()\printf() #include<cstring> // strcpy()\strcat()\strcmp()\strlen()\memset() #include<bits/stdc++.h> #include<cmath> //sqrt()\pow()\abs()\ceil()\floor()\max()\min() using namespace std; int taozi(int day){ if(day==10) return 1; return (taozi(day+1)+1)*2; } int main(){ cout<<taozi(1); return 0; }