2652. Sum Multiples

Given a positive integer n, find the sum of all integers in the range [1, n] inclusive that are divisible by 3, 5, or 7.

Return an integer denoting the sum of all numbers in the given range satisfying the constraint.

class Solution {
public:
    int sumOfMultiples(int n) {
        int res = 0;
        for(int i = 1; i <= n; i++) {
            if(i % 3 == 0 or i % 5 == 0 or i % 7 == 0) res += i;
        }
        return res;
    }
};