C :

#include<stdio.h>

void main(){
	int i,n,s=0;
	scanf("%d",&n);
	
	for(i=1;i<=n;i++){
		if((i%2==0&&i%3==0)||(i%2==0&&i%5==0)||(i%2==0&&i%7==0)||(i%3==0&&i%5==0)||(i%3==0&&i%7==0)||(i%5==0&&i%7==0)||(i%2==0&&i%3==0&&i%5==0)||(i%2==0&&i%3==0&&i%7==0)||(i%3==0&&i%5==0&&i%7==0)||(i%2==0&&i%3==0&&i%5==0&&i%7==0)){
			s=s+i;
		}
	}
	printf("%d",s);
}

C++ :

#include <bits/stdc++.h>
using namespace std;

int main(){
	int n,i,c,s = 0;
	cin>>n;
	for(i = 1;i <= n;i++){
		c = 0;
		if(i % 2 == 0){
			c++;
		}
		
		if(i % 3 == 0){
			c++;
		}
		
		if(i % 5 == 0){
			c++;
		}
		
		if(i % 7 == 0){
			c++;
		}
		
		if(c >= 2){
			s = s + i;
		}
	}
	
	cout<<s<<endl;
}

Python :

n=int(input())
i=1
s=0
for i in range(1,n+1):
    if i%6==0 or i%10==0 or i%14==0 or i%15==0 or i%21==0 or i%35==0:
        s+=i
        i+=1
print(s)