//Mihai Priboi

#include <stdio.h>
#include <stdlib.h>

int d, x, y;

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

int main() {
  FILE *fin, *fout;
  int n, a, d1, x1, y1;
  fin = fopen( "inversmodular.in", "r" );
  fscanf( fin, "%d%d", &a, &n );
  fclose( fin );
  euclid( a, n, &d1, &x1, &y1 );
  if( x1 <= 0 )
    x1 = n + x1 % n;
  fout = fopen( "inversmodular.out", "w" );
  fprintf( fout, "%d", x1 );
  fclose( fout );
  return 0;
}