C++ :

#include<bits/stdc++.h>
using namespace std;
int main() {
	int m,n;
	cin>>m>>n;
	int c = 0;
	for(int i = m;i <= n;i++){
		if(i % 6 == 0 || i % 8 == 0){
			c++;
		}
	}
	cout<<c;
	return 0;
}

Python :

m,n=map(int,input().split())
s=0
for i in range(m,n+1):
    if i%6==0 or i%8==0:
        s=s+1
print(s)