//acmp.ru 0970 ot_perestanovki_shtoto_menyaetsa.cpp 9%

#include <stdio.h>

int main(){
	freopen("INPUT.TXT", "r", stdin);
	freopen("OUTPUT.TXT", "w", stdout);

	int a,b,c;
	scanf("%i %i %i", &a, &b, &c);

	if(a+b == c || b+c == a || c+a == b){
		printf("YES");
	}else{
		printf("NO");
	}
}