#include <cstdio>

using namespace std;

int a,b,d,x,y;

inline void euclid(int a,int b)
{
    if(b==0)
    {
       x=1;
       y=0;
       return;
    }
    euclid(b,a%b);

    int x0=x;
    x=y;
    y=x0-(a/b)*y;
}

int main()
{
    freopen("inversmodular.in","r",stdin);
    freopen("inversmodular.out","w",stdout);

    scanf("%d%d",&a,&b);
    euclid(a,b);
    while(x<0) x+=b;
    printf("%d\n",x);
    return 0;
}