【codeforce】异或 与 或

E. Twisted Circuit

time limit per test

2 seconds

memory limit per test

64 megabytes

input

standard input

output

standard output

Input

The input consists of four lines, each line containing a single digit 0 or 1.

Output

Output a single digit, 0 or 1.

Example

Input

0
1
1
0

Output

0

从上到下表示异或、或、与和异或

#include<cstdio>
#include<algorithm>
using namespace std;
int main()
{
	int a,b,c,d;
	scanf("%d\n",&a);scanf("%d\n",&b);scanf("%d\n",&c);scanf("%d",&d);
	int t=((a^b)&(c|d))^((b&c)|(a^d));
	printf("%d\n",t);
	return 0;
 }