#include <iostream>
#include <cstdlib>
using namespace std;
char x;
void in(){
cin>>x;
if(x!='0' and x!='1')
exit(0);
x-='0';
}
void y(int p){
cout<<p;
}
int main()
{
a:in();y(0);if(x)goto f;goto b;
b:in();y(0);if(x)goto c;goto b;
c:in();y(0);if(x)goto d;goto d;
d:in();if(x){y(1);goto e;}y(0);goto b;
e:in();if(x){y(0);goto f;}y(1);goto d;
f:in();y(0);if(x)goto f;goto g;
g:in();y(0);if(x)goto e;goto b;
return 0;
}
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