AE00
#include<iostream>
#include<cmath>
using namespace std;
int main()
{
int a,d;
long int count=0;
float b,c;
cin>>a;
b=a;
c=sqrt(b);
d=c;
for(int i=1;i<=d;i++)
count=count+((a/i)-(d-i));
cout<<count<<endl;
return 0;
}
#include<iostream>
#include<cmath>
using namespace std;
int main()
{
int a,d;
long int count=0;
float b,c;
cin>>a;
b=a;
c=sqrt(b);
d=c;
for(int i=1;i<=d;i++)
count=count+((a/i)-(d-i));
cout<<count<<endl;
return 0;
}
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