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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, m;
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cin >> n >> m;
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int cnt = 0;
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for (int i = n; i <= m; i++) {
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int x = i;
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bool flag = false;
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while (x) {
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int a = x % 10;
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if (a % 2 == 0) flag = true;
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x /= 10;
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}
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if (!flag) cnt++;
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}
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cout << cnt << endl;
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return 0;
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}
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