#include <iostream>
#include <cstdio>
using namespace std;
void invMod(int &x,int &y,int a,int b)
{
    if(b==0)
    {
        x=1;
        y=0;
    }
    else
    {
        invMod(x,y,b,a%b);
        int aux=x;
        x=y;
        y=aux-(a/b)*y;
    }
}
int main()
{
    int a,b,x=1,y=0;
    freopen("inversmodular.in","r",stdin);
    freopen("inversmodular.out","w",stdout);
    scanf("%d%d",&a,&b);
    invMod(x,y,a,b);
    if(x<0)
        x=b+x%b;
    printf("%d",x);
    return 0;
}