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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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int n, c, count = 0; //a:10的个数，b:20的个数，c:50的个数
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cin >> n; //n元钞票
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for (c = 0; c <= 2 * n / 100; c++)
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//count += 5 * (n - c * 50) / 100 + 1;
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count += (n - c * 50) / 20 + 1;
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cout << count << endl;
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return 0;
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}
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