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