#include <cstdio>
#include <algorithm>
using namespace std;

void euclid(int a,int b,int &d,int &x,int &y){
    if(b==0)
    {
        x=1;
        y=0;
        d=a;
        return ;
    }
        int x0,y0;
        euclid(b,a%b,d,x0,y0);
        x=y0;
        y=x0-a/b*y0;
}

int main(){
    int a,b,d,x,y;
    freopen("inversmodular.in","r",stdin);
    freopen("inversmodular.out","w",stdout);
        scanf("%d %d",&a,&b);
        euclid(a,b,d,x,y);
        if(x<0)x += (x/b+1)*b;
        printf("%d\n",x);
    return 0;
}