#include <bits/stdc++.h>   using namespace std;   const int mod = 998244353;   const int inf = 0x3c3c3c3c;   const long long infl = 0x3c3c3c3c3c3c3c3c;   long long dp[5003][5003];   int A, B, C;   int main() {     ios::sync_with_stdio(0), cin.tie(0);     ;     cin >> A >> B >> C;     vector<int> v({A, B, C});     sort((v).begin(), (v).end());     for (int i = 0; i <= 5000; i++) dp[i][0] = 1;     for (int i = 1; i <= 5000; i++) {       for (int j = 1; j <= 5000; j++) {         dp[i][j] = (dp[i - 1][j - 1] * i + dp[i][j - 1]) % mod;       }     }     long long ans = 1;     ans = (ans * dp[v[2]][v[1]]) % mod;     ans = (ans * dp[v[2]][v[0]]) % mod;     ans = (ans * dp[v[1]][v[0]]) % mod;     cout << ans;   }   