#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;
}