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- #include <iostream>
- #include <cstring>
- #include <fstream>
- using namespace std;
- ifstream f("date.in");
- int v[100];
- void produs(int x, int v[] , int &n)
- {
- int i , t =0 , k;
- for(i=1;i<=n;i++)
- {
- k=x*v[i]+t;
- v[i]=k%10;
- t=k/10;
- }
- while(t>0)
- {
- n++;
- v[n]=t;
- t/=10;
- }
- }
- int main()
- {
- int x ;
- int i =1;
- int nr=0;
- int m ;
- int n , b ;
- cin>>n;
- v[1]=1;
- m=1;
- for(int j=1;j<=n;j++)
- produs(j,v,m);
- for(int i=m;i>=1;i--)
- cout<<v[i];
- }
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