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23 lines
454 B
C++
23 lines
454 B
C++
#define _CRT_SECURE_NO_WARNINGS
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#define _SILENCE_CXX17_C_HEADER_DEPRECATION_WARNING
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#include <bits/stdc++.h>
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using namespace std;
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int main()
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{
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map<int, int> M;
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for (int i = 0; i < 18; i++)
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{
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int x;
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scanf("%d", &x);
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M[x]++;
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}
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for (auto &i : M)
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if (i.first)
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i.second %= 2;
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int ans = 0;
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for (auto &i : M)
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ans += i.second;
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cout << ans;
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return 0;
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}
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