include <stdio.h>
int main() {
int a, b, c, d, e;
scanf("%d", &a);
e = a % 10;
a = a / 10;
d = a % 10;
a = a / 10;
c = a % 10;
a = a / 10;
b = a % 10;
if (d + b == e + c) {
printf("YES");
} else {
printf("NO");
}
return 0;
}
int main() {
int a, b, c, d, e;
scanf("%d", &a);
e = a % 10;
a = a / 10;
d = a % 10;
a = a / 10;
c = a % 10;
a = a / 10;
b = a % 10;
if (d + b == e + c) {
printf("YES");
} else {
printf("NO");
}
return 0;
}
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