#include <iostream>
using namespace std;
int main() {
int x,a,b,c,d,arj;
cin>>x;
a=x/1000;
b=(x-1000*a)/100;
c=(x-1000*a-100*b)/10;
d=x-1000*a-100*b-10*c;
arj=x/(a+d);
if(x<5000)
{
cout<<arj;
}
else
{
cout<<x;
}
return 0;
}
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