#include <iostream>
using namespace std;
char c[]={'A','U','G','C'};
int ct=0;
void func(string s) {
if(s.length() == 4) {
ct++;
return;
}
bool x=false;
for(int i=0; i<s.length(); i++) if(s[i]=='U') x=true;
func(s+'U');
func(s+'G');
func(s+'C');
if(!x) func(s+'A');
}
int main() {
// your code goes here
func("");
cout<<ct<<"\n";
return 0;
}
I2luY2x1ZGUgPGlvc3RyZWFtPgp1c2luZyBuYW1lc3BhY2Ugc3RkOwoKY2hhciBjW109eydBJywnVScsJ0cnLCdDJ307CmludCBjdD0wOwp2b2lkIGZ1bmMoc3RyaW5nIHMpIHsKCWlmKHMubGVuZ3RoKCkgPT0gNCkgewoJCWN0Kys7CgkJcmV0dXJuOwoJfQoJYm9vbCB4PWZhbHNlOwoJZm9yKGludCBpPTA7IGk8cy5sZW5ndGgoKTsgaSsrKSBpZihzW2ldPT0nVScpIHg9dHJ1ZTsKCWZ1bmMocysnVScpOwoJZnVuYyhzKydHJyk7CglmdW5jKHMrJ0MnKTsKCWlmKCF4KSBmdW5jKHMrJ0EnKTsKfQppbnQgbWFpbigpIHsKCS8vIHlvdXIgY29kZSBnb2VzIGhlcmUKCWZ1bmMoIiIpOwoJY291dDw8Y3Q8PCJcbiI7CglyZXR1cm4gMDsKfQo=