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#include <bits/stdc++.h>
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using namespace std;
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//这题30分的一般都是没有去重……1+4=5和2+3=5算同一个……
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//这道题还是挺有意思的，注意，前方有坑！需要理解 5=1+4=2+3，但5只算一次的道理。
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const int N = 110;
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int n;
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int a[N];
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bool b[N]; //标识已使用
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int cnt;
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int main() {
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cin >> n;
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for (int i = 1; i <= n; i++)cin >> a[i];
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//暴力三层循环+标识数组
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for (int i = 1; i < n; i++)
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for (int j = i + 1; j <= n; j++)
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for (int k = 1; k <= n; k++)
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if (a[k] == a[i] + a[j] && !b[k]) cnt++, b[k] = true;
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printf("%d", cnt);
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return 0;
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}
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