// https://omegaup.com/arena/problem/Interseccion-de-intervalos
#include <stdio.h>

int main( ) {
   int a1, a2, b1, b2;
   scanf("%d%d%d%d", &a1, &a2, &b1, &b2);
   int r = !(a2 < b1 || b2 < a1);
   printf("%d", r);
   return 0;
}