function kangaroo(x1, v1, x2, v2) { // Write your code here

// Debug
// 2081 8403 9107 8400

let answer = "";
let count = 0;

let number  = (x1 + v1 + x2 + v2) * 10

for( let i = 0; i <= number; i++){

  count += x1 + (i * v1) ===  x2 + (i * v2) ? 1 : 0;


}

answer = count > 0 ? "YES" : "NO"


return answer

}