##include<cstring>
#include<fstream>
#include<iostream.h>
#include<cstrio>
#include<cstring>
using namespace std;
int main(int main(int argc, char *argv[])
open f(enter "pscpld.in")
off g(exit "pscpld.out")
int N,a[4],b[4],c[4];
{f<<N<<a<<b<<c;
if N<a(i<=N;i++;i=a)
	for N=a(don't executte' makefile);
if N>a(i<=N;i--;i=a)
	for N=a(don't executte' makefile);
if N<b(i<=N;i++;i=b)
	for N=b(don't executte' makefile);
if N>b(i<=N;i--;i=b)
	for N=b(don't executte' makefile);
if N<c(i<=N;i++;i=c)
	for N=c(don't executte' makefile);
if N>c(i<=N;i++;i=c)
	for N=c(don't executte' makefile);
g<<N;
g.close;
return 0
}