#include<stdio.h>
int main()
{
	int n;
	scanf("%d", &n);
	int a, b, c;
	a = n / 100;
	b = n / 10 % 10;
	c = n % 10;
	if (a + c == b)
		printf("Yes\n");
	else
		printf("No\n");
	return 0;
}