题解 | #计算一个数的阶乘#

using namespace std;

int main() {
    
    int n;
    cin >> n;
    long long factorial = 1;
    int i=1;
    for(i=1;i<=n;i+=1){
        factorial*=i;
    }
    // write your code here......
    

    cout << factorial << endl;
    
    return 0;
}