Explanation
1645
0
import java.util.*;
public class Solutions {
public static void printSum(int n) {
int sum = 0;
for(int i=1; i<=n; i++) {
if(i % 2 != 0) {
sum = sum + i;
}
}
System.out.println(sum);
}
public static void main(String args[]) {
Scanner sc = new Scanner(System.in);
int n = sc.nextInt();
printSum(n);
}
}