#include<stdio.h>
int main()
{
    int a[6];
    int b[6];
    int p=0;
    for(int i=0;i<6;i++)
    {
        scanf("%d",&a[i]);
        scanf("%d",&b[i]);
    }
    for(int i=0;i<6;i++)
    {
        for(int j=1;j<7;j++)
            {
                if(a[i]==b[j])
                {
                    p++;          
                }
                else if(a[i+1]==b[j])
                {
                    p++;
                    if(p==6)
                    {
                        printf("2");
                    }
                } 
            }
    }

        
}

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