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20 lines
346 B
20 lines
346 B
#include <cmath>
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#include <iostream>
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using namespace std;
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int main() {
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long n;
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cin >> n;
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int a;
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/* a += floor(n / 5);
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a += floor(n / 25);
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a += floor(n / 125);
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a += floor(n / 625);
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a += floor(n / 3125);
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a += floor(n / 15625);*/
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for (int i = 0; i < 100; i++) {
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a += floor(n / pow(5, i + 1));
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}
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cout << a;
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}
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