#include <bits/stdc++.h>
using namespace std;

int main(){
	
	string s;
	while(cin>>s){
		int ans=0;
		for(int i=2;i<s.length();i++){//注意前面要跳过0x
			ans=ans*16;
			if(s[i]>='0'&&s[i]<='9'){
				ans+=s[i]-'0';
			}else{
				ans+=s[i]-'A'+10;
			}
		}
		cout<<ans<<endl;
	}
	return 0;
}