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#include <bits/stdc++.h>
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using namespace std;
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int cnt;
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/*
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110
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10
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*/
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int main() {
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int n;
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cin >> n;
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for (int i = 100; i <= n; i++)
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if (i % 10 != 3 && i % 100 / 10 != 5 && i % 1000 / 100 != 7)
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cnt++;
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printf("%d\n", cnt);
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return 0;
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} |
