1087 how many different values

#include <iostream>

using namespace std;

int main()
{
    int n;
    cin>>n;
    int sum=-1;
    int counter=0;
    for(int i=1;i<=n;i++)
    {
        if(i/2+i/3+i/5!=sum)
        {
            counter++;
            sum=i/2+i/3+i/5;
        }
    }
    cout<<counter;
    return 0;
}