#include "stdafx.h"
#include
int main()
{
int a, b, c;
scanf_s("%d,%d,%d", &a, &b, &c);
if (a > b > c || a > c > b)
printf("%d\n", a);
else if (b > a > c || b > c > a)
printf("%d\n", b);
else (c > a > b || c > b > a);
printf("%d\n", c);
return 0;
}