#include <stdio.h>

int A,N;

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

int main()
{
    long long 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;
}