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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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bool isPrime(int x) {
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for (int i = 2; i <= sqrt(x); i++)
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if (x % i == 0) return false;
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return true;
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}
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int main() {
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int n, m;
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cin >> n >> m;
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for (int i = n; i <= m; i++)
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if (isPrime(i)) cnt++;
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cout << cnt << endl;
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return 0;
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} |
