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

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

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