#include <bits/stdc++.h>   using namespace std;   int a, b, c;   int main() {     scanf( %d %d %d n , &a, &b, &c);     if (a == b && c == 0)       printf( YES n );     else if ((a != b && c == 0) || (a > b && c > 0) || (a < b && c < 0))       printf( NO n );     else {       if ((b - a) % c == 0)         printf( YES n );       else         printf( NO n );     }     return 0;   }   