23 lines
373 B
C++
23 lines
373 B
C++
#include<cstdio>
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#include<algorithm>
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using namespace std;
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typedef long long LL;
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LL exgcd(LL a,LL b,LL &x,LL &y)
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{
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if(b==0) { x=1; y=0; return a; }
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LL d=exgcd(b,a%b,x,y);
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LL z=x; x=y; y=z-(a/b)*y;
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return d;
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}
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int main()
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{
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#ifdef local
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freopen("pro.in","r",stdin);
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#endif
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LL a,b,x,y;
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scanf("%lld%lld",&a,&b);
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exgcd(a,b,x,y);
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printf("%lld\n",(x%b+b)%b);
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return 0;
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}
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