Codeforces Round 141 (Div. 2) A

Codeforces Round 141 (Div. 2) A.cpp

//By Brickgao
#include <iostream>
#include <set>
#include <cstdio>

using namespace std;

int main()
{
    __int64 tmp;
    set <__int64> rec;
    for(int i = 1; i <= 4; i++)
    {
        cin >> tmp;
        rec.insert(tmp);
    }
    __int64 ans = 4 - rec.size();
    printf("%I64d\n", ans);
    return 0;
}