function solution(n) {
let answer = 0
for (let i=0; i<=n; i++) {
if (i % 2 === 0)
answer += i;
}
return answer;
}
function solution(n) {
let answer = 0;
for (let i = 0; i <= n; i++) {
if (i % 2 === 0) answer += i;
}
return answer;
}