#include <stdio.h>
#include <string.h>
int main()
{
char b[100], i;
short a = 0;
scanf("%s", b);
for (i = strlen(b) - 1; i >= 0; i -= 2)
a += b[i] - 48;
for (i = strlen(b) - 2; i >= 0; i -= 2)
a += b[i] * 2 - 96;
printf("%d\n", a % 3);
return 0;
}