#include<cstdio>



void euclid(int a, int b, int *d, int *x, int *y)
{
    if(b==0)
    {
        *d=a;
        *x=1;
        *y=0;
    }
    else
    {
        int x0,y0;
        euclid(b,a%b,d,&x0,&y0);
        *x=y0;
        *y=x0-(a/b)*y0;
    }
}



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