#include<cstdio>
#include<algorithm>
using namespace std;
void euclid(int a,int b,int *x,int *y)
{
    if(b==0)
    {
        *x=1;
        *y=0;
        return;
    }
    int x0,y0;
    euclid(b,a%b,&x0,&y0);
    *x=y0;
    *y=x0-(a/b)*y0;
}
int main()
{
    int a,n,x,y;
    freopen("inversmodular.in","r",stdin);
    freopen("inversmodular.out","w",stdout);
    scanf("%d%d",&a,&n);
    euclid(a,n,&x,&y);
    for(;x<0;x+=n);
    printf("%d",x);
    return 0;
}