2652_Sum_Multiple.cpp

class Solution {
public:
    int sumOfMultiples(int n) {
        int sum = 0;
        for(int i=0 ; i<=n ; ++i){
            if(i%3 == 0 || i%5 == 0 || i%7 == 0){
                sum += i;
                }
            }
        return sum;
    }
};