include <bits/stdc++.h>

using namespace std;

int main()
{
long long x,y=0;
cin >>x;
int d=0;
while(d!=1)
{
int i=0,a,h=0;
int n=x+y;
int b=n%10;
n=n/10;
while(n!=0)
{
a=n%10;
if(b==a)
{
b=a;
h++;
}
n/=10;
i++;
}
if(h==i)
d++;
else y++;
}
cout <<y;
return 0;
}