/C01070 - GHÉP HÌNH

              #define _CRT_SECURE_NO_WARNINGS
        #include <stdio.h>
        #include <math.h>
        
        void swap(int* a1, int* a2) {
          int t = *a1;
          *a1 = *a2;
          *a2 = t;
        }
        
        int main() {
        
          int a1, a2, b1, b2, c1, c2;
        
          scanf("%d %d", &a1, &a2);
          scanf("%d %d", &b1, &b2);
          scanf("%d %d", &c1, &c2);
        
          if (a1 < a2) swap(&a1, &a2);
          if (b1 < b2) swap(&b1, &b2);
          if (c1 < c2) swap(&c1, &c2);
        
          if (b1 > a1) {
            swap(&b1, &a1);
            swap(&b2, &a2);
          }
        
          if (c1 > a1) {
            swap(&c1, &a1);
            swap(&c2, &a2);
          }
        
          if (c1 > b1) {
            swap(&c1, &b1);
            swap(&c2, &b2);
          }
        
          int c = a1;
        
          if ((b1 + c1 == c && b2 == c2) || (b1 + c2 == c && b2 == c1) || (c2 + b2 == c && c1 == b1)) {
            printf("YES\n");
          }
          else {
            printf("NO\n");
          }
        
          return 0;
        }