#include <cstdio>

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

int main(){
    int a,n,d,x,y;
    freopen("inversmodular.in","r",stdin);
    freopen("inversmodular.out","w",stdout);
        scanf("%d %d",&a,&n);

        euclid(a,n,d,x,y);

        if( x < 0 )x += (x/n + 1)*n;

        printf("%d\n",x);

    return 0;
}