include fstream using namespace std ifstream cin sum in ofstream cout

#include <fstream>

using namespace std;

ifstream cin("sum.in");
ofstream cout("sum.out");

long long answer=0,mod;

int F(long long x){
	answer=0;
	mod=123456789;
	
	for(int i=1;i<=x;i++){
		for(int j=1;j<=i;j++){
			if(i%j==0)answer=(answer+j*j)%mod;
		}
	}
	return answer;
}

int main(){
	long long n;
	cin>>n;
	
	F(n);
	
	cout<<answer;
	
	return 0;
}