#include <stdio.h>
long a,n;
long long x,y,c;
void euclid(long long a, long long b)  
{
    if(!b)x=1,y=0;  
    else  
    {euclid(b,a%b);
	 c=x;x=y;y=c-y*(a/b);}}
int main()
{
    freopen("inversmodular.in","r",stdin);
    freopen("inversmodular.out","w",stdout);
    scanf("%ld%ld",&a,&n);
    euclid(a,n);
    if(x<1)x=n+x%n;
    printf("%lld\n",x);
    return 0;
}