Solution-CF228-D2-A

#include <iostream>

using namespace std;

int main()
{
    int shoeArr[4];
    int diffShoe=0;
    for(int index=0;index<4;index++){
        cin>>shoeArr[index];
    }
    for(int index1=0;index1<4;index1++){
        for(int index2=index1+1;index2<4;index2++){
            if(shoeArr[index1]==shoeArr[index2]){
                diffShoe++;break;
            }
        }
    }
    cout<<diffShoe<<endl;
    return 0;
}