include <bits/stdc++.h>

//#include <iostream>
using namespace std;</iostream>

int main() {
float inNum;
int outNum;
while (cin >> inNum) { // 注意 while 处理多个 case
/* get the right most number*/
int rightMst = 0;
rightMst = ((int)(inNum * 10))%10;
if(rightMst < 5)
{
outNum = int(inNum);
}
else
{
outNum = int(inNum+1);
}
cout << outNum << endl;
}
}