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#include <bits/stdc++.h>
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#define ll long long
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using namespace std;
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int n, m;
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bool calced[51][51];
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int dp[51][51];
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int calc(int r, int c) {
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    if (r > n || r < 1 || c > m || c < 1) {
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        return 0;
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    } else if (r == n && c == m) {
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        return 1;
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    } else if (calced[r][c]) {
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        return dp[r][c];
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    } else {
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        dp[r][c] = calc(r + 2, c + 1) + calc(r + 1, c + 2);
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        calced[r][c] = true;
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        return dp[r][c];
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    }
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}
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int main() {
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    std::ios_base::sync_with_stdio(false);
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    cin.tie(0);
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    cout.tie(0);
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    cin >> n >> m;
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    cout << calc(1, 1);
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    return 0;
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}
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