function getTotalX(a, b) {
    // Write your code here
    let total = 0;
    let current = a[a.length - 1];
    while(current <= b[0]){
        
        if( a.every(n => !(current%n)) ) {
            if( b.every(n => !(n%current)) ) {
                total++;
            }
        }
        current++;
    }
    return total;
}