#include <stdio.h>
#include <stdlib.h>
int a,n,x,y;

void cmmdc(int a, int n, int &x, int &y)
{
    if(n==0)
    {
        x=1;
        y=0;
        return;
    }
    int x0=0, y0=0;
    cmmdc(n,a%n, x0, y0);
    x=y0;
    y=x0-y0*(a/n);
}
int main(){

    freopen("inversmodular.in","r",stdin);
    freopen("inversmodular.out","w",stdout);

    scanf("%d%d",&a,&n);

    cmmdc(a,n,x,y);
    while(x<0){
        x=n+x%n;
    }

    printf("%d",x);
    return 0;
}