#include <cstdio>

using namespace std;
int euclid(int a, int b ,long long *x,long long *y)
{
    if(b==0)
    {
    *x=1;
    *y=0;
    return a;
    }
    long long x1,y1,na;
    na= euclid(b,a%b,&x1,&y1);
    *x=y1;
    *y=x1-(a/b)*y1;
    return na;
}
int main()
{
    freopen("inversmodular.in","r",stdin);
    freopen("inversmodular.out","w",stdout);
    int t;
    int a,b,c;
    c=1;
    scanf("%d%d",&a,&b);
    long long x,y,na;
    na= euclid(a,b,&x,&y);
    if(x<=0)
        x+=b+x%b;
    printf("%lld",x);
    return 0;
}