#include <cstdio>

using namespace std;

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

int main()
{
    int A,N,x,y,d,sol,cN;
    freopen("inversmodular.in","r",stdin);
    freopen("inversmodular.out","w",stdout);
    scanf("%d%d", &A,&N);
    EuclidExtins(A,N,x,y);
    if(x<0)
        x=N+x%N;
    printf("%d\n", x);
    return 0;
}