ARC125 B – Squares

//C++ language

#include<iostream>
#define MOD 998244353ll
using namespace std;
int main(){
    long long n, ans=0;
	cin>>n;
	for (int i = 1; i <= n / i; i++)
		ans = (ans + ((n / i) - i + 2) / 2) % MOD;
	cout<<ans<<"\n";
	return 0;
}