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- #include<bits/stdc++.h>
- using namespace std;
- int main()
- {
- //freopen("in.txt","r",stdin);
- // freopen("out.txt","w",stdout);
- long long int a,b,c,n,r,i,j,k,ans;
- while(cin>>n>>r)
- {
- ans=1;
- a=n-r;
- for(i=n;i>a;i--)
- {
- ans*=i;
- while(ans%10==0)
- {
- ans/=10;
- }
- ans%=1000000000;
- }
- cout<<ans%10<<endl;
- }
- return 0;
- }
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