#include<cstdio>
long long int a,n,x,y;

void gcd(long long int a,long long int b)  
{  
	if(!b)  { x=1;y=0; }
	else{ gcd(b,a%b);  long long int aux=x;x=y;y=aux-y*(a/b);	}
}

int main()
{
    freopen("inversmodular.in","r",stdin);
	freopen("inversmodular.out","w",stdout);
	scanf("%d %d",&a,&n);
    gcd(a,n);
    if(x<=0)  x=n+x%n;
	printf("%lld",x);
    return 0;
}