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26 lines
513 B
26 lines
513 B
#include <bits/stdc++.h>
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using namespace std;
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int main() {
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int n;
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cin >> n;
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int a[1000] = {0};
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int guaidianCount = 0;
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for (int i = 0; i < n; i++) {
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cin >> a[i];
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}
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for (int i = 1; i < n - 1; i++) {
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if (a[i] - a[i - 1] > 0 && a[i + 1] - a[i] < 0) {
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guaidianCount++;
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}
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if (a[i] - a[i - 1] < 0 && a[i + 1] - a[i] > 0) {
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guaidianCount++;
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}
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}
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cout << guaidianCount << endl;
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return 0;
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}
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