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