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27 lines
470 B
27 lines
470 B
#include <bits/stdc++.h>
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using namespace std;
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int p, q, res;
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/*
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测试数据：
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4 7
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根据公式，最大无法凑出的是:4*7-4-7=17
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*/
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bool dfs(int x) {
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if (x == 0) return true;
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if (x >= p && dfs(x - p)) return true;
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if (x >= q && dfs(x - q)) return true;
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return false;
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}
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int main() {
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scanf("%d %d", &p, &q);
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for (int i = 1; i <= 1000; i++)
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if (!dfs(i)) res = i;
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printf("%d\n", res);
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return 0;
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}
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