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20 lines
307 B
C++
20 lines
307 B
C++
#include <iostream>
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using std::cin;
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using std::cout;
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const char endl = '\n';
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long long a, b, c, ans;
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int main() {
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cin >> a >> b;
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a ^= 9961, b ^= 9961;
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a += 17;
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b += a + 17;
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a *= 81, b *= 81;
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c = a + b - 4;
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ans = (c / 10) * 10 + 1;
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cout << ans % 9 << endl;
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return 0;
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}
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