30 lines
505 B
C++
30 lines
505 B
C++
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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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ios::sync_with_stdio(0);
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cin.tie(0);
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int total = 0;
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string line;
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while (getline(cin, line) && !line.empty()) {
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istringstream l(line);
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vector<int> t;
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while (!l.eof()) {
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int x;
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l >> x;
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t.push_back(x);
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}
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int pos = (t[1] > t[0]) ? 1 : -1;
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for (int i = 0; i < t.size() - 1; i++) {
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int diff = (t[i + 1] - t[i]) * pos;
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if (diff < 1 || diff > 3) {
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goto next;
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}
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}
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total++;
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next:;
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}
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cout << total << '\n';
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}
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