#include<cstdio>

 #include<algorithm>

 #include<cstring>

 #include<vector>

 using namespace std;

 #define fi first

 #define se second

 #define mp make_pair

 #define pb push_back

 typedef long long ll;

 typedef unsigned long long ull;

 typedef pair<int,int> pii;

 #define md 998244353

 ll n,a1,a2,a3;

 ll calc(ll x)    {return x*(x+)%md*(*x+)%md*%md;}

 int main()

 {

     ll i,j,t;

     scanf("%lld",&n);

     for(i=;i<=n;i=j+)

     {

         t=n/i;

         j=min(n,n/t);

         a1=(a1+(calc(j)-calc(i-)+md)%md*t%md)%md;

         a2=(a2+(i+j)*(j-i+)%md*%md*t%md)%md;

         a3=(a3+(j-i+)*t)%md;

     }

     printf("%lld",(*a1+*a2+*a3)%md);

     return ;

 }