#include <stdio.h>

int A,N,x,y;

inline void euclid(int a,int b,int &x,int &y)
{
    int x0,y0;

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

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

    scanf("%d%d",&A,&N);

    x=0;
    y=0;

    euclid(A,N,x,y);

    if(x>=0) printf("%d\n",x);
    else
    {
        y=x;
        x+=(y/N)*N;
        if(y%N) x+=N;
        printf("%d\n",x);
    }
    
    return 0;
}