#include <bits/stdc++.h> using namespace std; int main(){ string ss,s; cin>>s; long long n,m=0; for(int i=0;i<s.size();i++){ if(s[i]>='A'&&s[i]<='F'){ n=s[i]-'A'+10; }else{ n=s[i]-'0'; } m=m*16+n;//十进制：m } char c; if(m==0) ss="0"; while(m>0){ c=m%2+'0'; ss=c+ss; m=m/2; } cout<<ss; return 0; }