2023.3.19 AM 09:45 by CBJ

數學
//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;
}

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