#include <bits/stdc++.h>
using namespace std;
int main()
{
string s;cin>>s;
int pos=s.find('.');
int res=0;
for(int i=0;i<pos;++i)res=res*10+s[i]-'0';
if(s[pos+1]>='5')res++;
cout<<res<<endl;
return 0;
}
#include <bits/stdc++.h>
using namespace std;
int main()
{
string s;cin>>s;
int pos=s.find('.');
int res=0;
for(int i=0;i<pos;++i)res=res*10+s[i]-'0';
if(s[pos+1]>='5')res++;
cout<<res<<endl;
return 0;
}