a, b = map(int, input().split())
if b - a > 10:
print(0)
else:
d = 1
for i in range(a+1, b+1):
d = d * i % 10
print(d)#include <bits/stdc++.h>
#include <iostream>
using namespace std;
typedef long long ll;
#define go() ios::sync_with_stdio(0); cin.tie(0); cout.tie(0)
const int M=1e9+7;
int add(int a,int b)
{
return (a%M+b%M)%M;
}
ll multi(ll a,ll b,ll m)
{
return (a%m*b%m)%m;
}
ll factorial(ll n,ll x)
{
int ans=1;
return ( x == 0 ) ? 1 : multi(n , factorial(n - 1 , x - 1) , 10);
}
int main()
{
go();
ll a,b; cin>>a>>b;
ll x=b-a;
if(x>10) cout<<0<<endl;
else cout<<(factorial(b,x)%10);
}
119A - Epic Game | 703A - Mishka and Game |
1504C - Balance the Bits | 988A - Diverse Team |
1312B - Bogosort | 1616B - Mirror in the String |
1660C - Get an Even String | 489B - BerSU Ball |
977C - Less or Equal | 1505C - Fibonacci Words |
1660A - Vasya and Coins | 1660E - Matrix and Shifts |
1293B - JOE is on TV | 1584A - Mathematical Addition |
1660B - Vlad and Candies | 1472C - Long Jumps |
1293D - Aroma's Search | 918A - Eleven |
1237A - Balanced Rating Changes | 1616A - Integer Diversity |
1627B - Not Sitting | 1663C - Pōja Verdon |
1497A - Meximization | 1633B - Minority |
688B - Lovely Palindromes | 66B - Petya and Countryside |
1557B - Moamen and k-subarrays | 540A - Combination Lock |
1553C - Penalty | 1474E - What Is It |