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

string str;

int main()
{
	char x;
	while((x=getchar())!=EOF)
	{
		
		getline(cin,str);
		int num=0;bool flag=false;
		if(x=='-')flag=true;
		else
		{
			if(x>='0'&&x<='9')
				num+=x-'0';
			else if(x>='a'&&x<='f')
				num+=x-'a'+10;
			else num+=x-'A'+10;
		}
		for(int i=0;i<str.length();i++)
		{
			num*=16;
			if(str[i]>='0'&&str[i]<='9')
				num+=str[i]-'0';
			else if(str[i]>='a'&&str[i]<='f')
				num+=str[i]-'a'+10;
			else num+=str[i]-'A'+10;
		}
		if(flag)num=-num;
		printf("%d\n",num);
	//	str.~string();//?????????
		
	}
	return 0;
}