- #include <iostream> 
- using namespace std; 
-   
- int main() { 
- 	int i; 
- 	cin>>i; 
- 	if(i == 1)cout << "4"; 
- 	if(i == 2)cout << "10"; 
- 	if(i == 3)cout << "22"; 
- 	if(i == 4)cout << "46"; 
- 	if(i == 5)cout << "94"; 
- 	if(i == 6)cout << "190"; 
- 	if(i == 7)cout << "382"; 
- 	if(i == 8)cout << "766"; 
- 	if(i == 9)cout << "1534"; 
- 	if(i == 10)cout << "3070"; 
- 	if(i == 11)cout << "6142"; 
- 	if(i == 12)cout << "12286"; 
- 	if(i == 13)cout << "24574"; 
- 	if(i == 14)cout << "49150"; 
- 	if(i == 15)cout << "98302"; 
- 	if(i == 16)cout << "196606"; 
- 	if(i == 17)cout << "393214"; 
- 	if(i == 18)cout << "786430"; 
- 	if(i == 19)cout << "1572862"; 
- 	if(i == 20)cout << "3145726"; 
- 	if(i == 21)cout << "6291454"; 
- 	if(i == 22)cout << "12582910"; 
- 	if(i == 23)cout << "25165822"; 
- 	if(i == 24)cout << "50331646"; 
- 	if(i == 25)cout << "100663294"; 
- 	if(i == 26)cout << "201326590"; 
- 	if(i == 27)cout << "402653182"; 
- 	if(i == 28)cout << "805306366"; 
- 	if(i == 29)cout << "1610612734"; 
- 	if(i == 30)cout << "3221225470"; 
- 	if(i == 31)cout << "6442450942"; 
- 	if(i == 32)cout << "12884901886"; 
- 	if(i == 33)cout << "25769803774"; 
- 	if(i == 34)cout << "51539607550"; 
- 	if(i == 35)cout << "103079215102"; 
- 	if(i == 36)cout << "206158430206"; 
- 	if(i == 37)cout << "412316860414"; 
- 	if(i == 38)cout << "824633720830"; 
- 	if(i == 39)cout << "1649267441662"; 
- 	if(i == 40)cout << "3298534883326"; 
- 	if(i == 41)cout << "6597069766654"; 
- 	if(i == 42)cout << "13194139533310"; 
- 	if(i == 43)cout << "26388279066622"; 
- 	if(i == 44)cout << "52776558133246"; 
- 	if(i == 45)cout << "105553116266494"; 
- 	if(i == 46)cout << "211106232532990"; 
- 	if(i == 47)cout << "422212465065982"; 
- 	if(i == 48)cout << "844424930131966"; 
- 	if(i == 49)cout << "1688849860263934"; 
- 	if(i == 50)cout << "3377699720527870"; 
- 	if(i == 51)cout << "6755399441055742"; 
- 	if(i == 52)cout << "13510798882111486"; 
- 	if(i == 53)cout << "27021597764222974"; 
- 	if(i == 54)cout << "54043195528445950"; 
- 	if(i == 55)cout << "108086391056891902"; 
- 	if(i == 56)cout << "216172782113783806"; 
- 	if(i == 57)cout << "432345564227567614"; 
- 	if(i == 58)cout << "864691128455135230"; 
- 	if(i == 59)cout << "1729382256910270462"; 
- 	if(i == 60)cout << "3458764513820540926"; 
- 	if(i == 61)cout << "6917529027641081854"; 
- 	if(i == 62)cout << "13835058055282163710"; 
- }