All output can not be an integer divisible by 3 to 1 among n

#include <iostream>using namespace std;
int main()
{    
int i, n;
cin >> n;            
for(int i=1;i<=n;i++)    
{        
if(i%3!=0)        
{            
cout<<i<<" ";                    
}    
}    
cout<<endl;
}