#include <stdio.h>

int main(void){
	int N,a,b,c;
	
	scanf("%d", &N);
	
	a = N / 100;
	b = (N % 100) /10;
	c = N -a*100-b*10;
	
	if(a + c == b)
		printf("Yes");
	else 
		printf("No");
	return 0;
}