Codeforces_228A

//Codeforces Round 228A
#include <iostream>
using namespace std;
int main()
{
    long double s[4], answ=0;
    for(int i=0;i<4;i++) cin >> s[i];

    if(s[0]==s[1] || s[0]==s[2] || s[0]==s[3]){answ++;}
    if(s[1]==s[2] || s[1]==s[3]){answ++;}
    if(s[3]==s[2]){answ++;}
    cout << answ;
    return 0;
}