function countPerfectSquareSubgrids(H, W) {
    let count = 0;
    let maxSize = Math.min(H, W);

    for (let size = 1; size <= maxSize; size++) {
        let horizontalOptions = H - size + 1;
        let verticalOptions = W - size + 1;
        count += horizontalOptions * verticalOptions;
    }

    return count;
}

// Sample Input
const H = 5;
const W = 3;

console.log(countPerfectSquareSubgrids(H, W)); // Output: 26