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#include <iostream>
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using namespace std;
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// 123
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bool dzs(int x) {
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int p = 10;
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while (x) {
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if (x % 10 > p) return false;
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p = x % 10;
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x /= 10;
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}
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return true;
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}
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int n, cnt;
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int main() {
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cin >> n;
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for (int i = 11; i <= n; i++)
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if (dzs(i)) cnt++;
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printf("%d\n", cnt);
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return 0;
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} |
