#include <bits/stdc++.h>
#define endl '\n'
using namespace std;
long long ans = 1073741824; // 2^30
int main()
{
    for (long long x = 2020; x <= 10000; x++)
    {
        for (long long y = x + 1; y <= 10000; y++)
        {
            if (y * y - x * x == x * x - 2019 * 2019 && x + y < ans)
                ans = y + x;
        }
    }
    cout << ans << endl;
}

#include <bits/stdc++.h>
#define endl '\n'
using namespace std;
bool vis[10005];       // 判断素数
long long n, c[10005]; // 存储素数
long long f[10005];    // 动规数组
void dfs()             // 乱起的函数名
{
    for (long long i = 2; i <= 2019; i++)
    {
        if (vis[i])
            continue;
        c[++n] = i;
        for (long long j = 2; j * i <= 2019; j++)
            vis[j * i] = 1;
    }
}
int main()
{
    dfs();
    f[0] = 1;
    for (long long i = 1; i <= n; i++)
    {
        for (long long j = 2019; j >= c[i]; j--)
            f[j] += f[j - c[i]];
    }
    cout << f[2019] << endl;
}

#include <bits/stdc++.h>
#define endl '\n'
using namespace std;
int cnt;
int main()
{
    for (int i = 4; true; i++)
    {
        cnt = 0; // 记得清空
        for (int j = 1; j <= i; j++)
        {
            if (i % j == 0)
                cnt++; // 统计
        }
        if (cnt == 100)
        {
            cout << i << endl; // 输出
            return 0;          // 找到就退出
        }
    }
}

#include <bits/stdc++.h>
#define endl '\n'
using namespace std;
char c;
string ans[5] = {"7020", "55965365465060", "2444", "45360", "206"};
int main()
{
    cin >> c;
    cout << ans[c - 'A'] << endl;
    return 0;
}