#include <studio.h>

int main (void) {
        int a, b, c;
        int sum;

        scanf("%d %d %d", &a, &b, &c);
        sum = (a + b + c) / 2;
        if(sum == a || sum == b || sum == c) {
                printf("YES");
        } else {
                printf("NO");
        }

        return 0;
}