function solution(A) {
// write your code in JavaScript (Node.js 8.9.4)
for (let i = 1; i < A.length ; i++) {
let max = -Infinity;
for (let j = 1; j <= 6; j++) {
if (i - j >= 0) {
const sum = A[i] + A[i-j];
max = max < sum ? sum : max;
}
}
A[i] = max;
}
return A[A.length-1];
}