#define _CRT_SECURE_NO_WARNINGS 
#include<stdio.h>
int a, b, c, d, sum,snm;

int main()
{
	scanf("%x%x%x%x", &a, &b, &c, &d);
	sum = a + b + c + d;
	printf("主指令加副指令 = %x\n", sum);
	snm = sum % 256;
	printf("校验和 = %x", snm);
	return 0;
}