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#include <cmath>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <iostream>
#include <string>
#include <vector>
#include <queue>
#include <algorithm>
using namespace std;
bool mark[10];

int main() {

    int n;
    cin >> n;
    while(true) {
        ++n;
        int t = n, cnt = 0;
        memset(mark, false, sizeof(mark));
        for(int i = 0; i < 4; ++i) {
            if(!mark[t%10]) mark[t%10] = true, cnt++;
            t /= 10;
        }
        if(cnt == 4) break;
    }
    cout << n << endl;
    return 0;
}

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