#include<cstdio>

int a,n,y,x;

void getXY(int a,int b,int &x,int &y)
{
    if(b==0)
    {
        x=1;
        y=0;
    }
    else
    {
        int x2,y2;
        getXY(b,a%b,x2,y2);
        x=y2;
        y=x2-(a/b)*y2;
    }
}

int main()
{
    freopen("inversmodular.in","r",stdin);
    freopen("inversmodular.out","w",stdout);
    scanf("%d%d",&a,&n);
    getXY(a,n,x,y);
    while(x<0)x+=n;
    printf("%d\n",x);
    return 0;
}