#include<stdlib.h> // atoi
extern char **environ;
int main() {
	while(*environ != 0) {
		if(strncmp(*environ, "EXITVAL=", 8) == 0) {
			int v = atoi((*environ)+8);
			if(0 <= v && v <= 255)
				return v;
			else
				return 255;
		}
		*environ++;
	}
	return 255;
}