#include <stdio.h>


long int xx,a,b;
int x[1000],y[1000],z[1000];
int unu[1000];


int getCifra(int *a, int i){
  if (i>a[0])
    return 0;
  else
    return a[i];
}



void suma(int *a, int *b, int *c) {
  int t = 0,max;
  max = a[0];
  if (max<b[0]) max=b[0];
  for (int i=1;i<=max;i++) {
    int aux = getCifra(a,i)+getCifra(b,i)+t;
    c[i]=aux%10;
    t=aux/10;
  }
  if (t==1) {
    c[0]=max+1;
    c[max+1]=1;
  } else {
    c[0]=max;
  }
}


void mul(int *a, int b, int *c) {
  int t = 0,max;
  max = a[0];
//  if (max<b[0]) max=b[0];
  for (int i=1;i<=max;i++) {
    int aux = getCifra(a,i)*b+t;
    c[i]=aux%10;
    t=aux/10;
  }
  c[0]=max;
  while (t!=0) {
    c[0]++;
    c[c[0]]=t%10;
    t=t/10;
  }
}

int verif01(int *a){
  int i;
  for (i=1; i<=a[0]; i++) {
    if (a[i]>1)
      return 0;
  }
  return 1;
}


void atrib(int *a,int *b){
  for (int i=0;i<=b[0];i++) {
    a[i]=b[i];
  }
}


int main(){
  int n,i;
  FILE *f = fopen("multiplu.in","r");
  fscanf(f,"%ld %ld",&a, &b);
  fclose(f);
  x[0]=0;
  xx=a*b;
  while (xx!=0) {
    x[0]++;
    x[x[0]]=xx%10;
    xx/=10;
  }
  unu[0]=unu[1]=1;
  i=2;
  atrib(z,x);
  while (!verif01(x)){
//    suma(x,unu,y);
    mul(z,i,x);
//    atrib(x,y);
    i++;
  }



  FILE *g = fopen("multiplu.out","w");
  for (i=x[0];i>0;i--){
    fprintf(f,"%d",x[i]);
  }
  fclose(g);
  return 0;
}