#include
using namespace std;
int main(){
unsigned long long n,m=1;
cin>>n;
for(int i=1;i<=n;i++){
m=m*i;
}
cout<
}
#include
using namespace std;
int main(){
unsigned int n;
unsigned long long factorial = 1;
cout << "输入一个整数: ";
cin >> n;
for(int i = 1; i <=n; ++i)
{
factorial *= i;
}
cout << n << " 的阶乘为："<< " = " << factorial;
return 0;
}
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