#include <cstdio>

using namespace std;
FILE *f,*g;

void inv(long long a,long long b,long long &x,long long &y)
{
    if(!b)
        x=1,y=0;
    else
    {
        inv(b,a%b,x,y);
        int aux=x;
        x=y;
        y=x-a/b*y;
    }
}
int main()
{
    f=fopen("inversmodular.in","r");
    g=fopen("inversmodular.out","w");
    long long nr,mod,x,y;
    fscanf(f,"%lld %lld",&nr,&mod);
    inv(nr,mod,x,y);
    if(x<=0)
        x=mod+x%mod;
    fprintf(g,"%lld\n",x);
    fclose(f);
    fclose(g);
    return 0;
}