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userId_undefined

ZhangCxuan ^—^

倔强青铜

2024-07-29 14:01:08

发布于：浙江

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#include <iostream>
using namespace std;
long long n,c,ans=0;
long long check(int a) {
	long long cnt=1;
	bool flag[8]  = {};
	while (a) {
		long long b = a % 10;
		if (b != 7 and b != 5 and b != 3) {
			return cnt;
		}flag[b]=true;
		cnt *= 10;
		a/=10;
	}
	if (flag[7] and flag[5] and flag[3]) {
		return 0;
	}else return 1;
}
int main() {
	freopen("number.in","r",stdin);
	freopen("number.out","w",stdout);
	cin >> n;
	for (long long i = 357;i <= n;i += c) {
		c=check(i);
		if (c == 0) {
			ans ++;
			i ++;
		}
	}cout << ans;
	fclose(stdin);
	fclose(stdout);
	return 0;
}
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