/*#include<fstream.h>
#include <math.h>
ifstream fin("inversmodular.in");
ofstream fout("inversmodular.out");
long long c[10000];
//const int n_max = 10001; // Definim numarul maxim de cifre al numerelor
int main()
{
	long i,a,n,j,prim,k=0;
	long sol;
	fin>>a>>n;
	if((n+1)%a==0)
	{
		fout<<(n+1)/a;
		return 0;
	}
	if(a+1==n)
		{
			fout<<a;
			return 0;
		}
for(i=2;i<=n;i++)
{
prim=1;
for(j=2;j<=i/2;j++)
if(i%j==0) prim=0;
if(prim==1) 
	{
		k++;	
		c[k]=i;
	}
}

	
for(i=0;i<=k;i++)
	if((a*c[i])%n==1)
	{
		fout<<c[i];
	return 0;
	}
	while(i<=n-1 && sol%n!=1)
	//	if( (i&p) >0)
		{
			i++;
			sol=sol+sol;
			
			
			
		}
	fout<<i-1;
return 0;
}
/*int main()
{
unsigned int i, n, p;
	long long a, sol = 1;
	fin>>n>>p;
	a=n;
	for(i=0; (1<<i) <= p;i++)
		{
			if( ((1<<i) & p) > 0)
				sol=(sol*a)%m;
			a=(a*a)%m;
		}
	fout<<sol<<'\n';
	return 0;
}*/
#include<fstream.h>
#include <stdio.h>
ifstream fin("inversmodular.in");
ofstream fout("inversmodular.out");
int A, N;
void gcd(long long &x, long long &y, int a, int b)  
{  
	long long aux;
     if (!b)  
         x = 1, y = 0;  
     else  
     {             
         gcd(x, y, b, a % b);
         aux = x;
         x = y;
         y = aux - y * (a / b);
     }
}

int main()
{
    long long inv = 0, ins;
    fin>>A>>N;
    //scanf("%d %d", &A, &N);
    gcd(inv, ins, A, N);

    if (inv <= 0)
       inv = N + inv % N;
       
    //printf("%lld\n", inv);
      fout<<inv;
    return 0;
}