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28 lines
594 B
C++
28 lines
594 B
C++
#include <bits/stdc++.h>
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using namespace std;
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typedef long long ll;
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int m[] = {0, 3, 5, 7};
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int main()
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{
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ll n;
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scanf("%lld", &n);
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int cnt = 0;
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for (int i = 0;; i++)
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{
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ll cur = 0;
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bool b[4] = {0};
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char buf[20];
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int l = 0, x = i;
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do
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buf[l++] = x & 3, x >>= 2;
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while (x);
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for (int j = l - 1; j >= 0; j--)
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cur = cur * 10 + m[buf[j]], b[buf[j]] = true;
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if (cur > n)
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break;
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if (!b[0] && b[1] && b[2] && b[3])
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cnt++;
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}
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printf("%d", cnt);
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return 0;
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} |