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#include <cstdio>
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void exgcd(int a, int b, int& x, int& y)
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{
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if (b == 0) x = 1, y = 0;
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else exgcd(b, a%b, y, x), y -= x*(a / b);
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}
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int main()
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{
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int a, b, x, y;
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scanf("%d%d", &a, &b);
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exgcd(a, b, x, y);
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while (x < 0) x += b;
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printf("%d", x);
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return 0;
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} |
