#include <stdio.h>
int main(void) {
int n, s, a, b, f, h, j, k, l, q, w, e, r, t ;
scanf("%d", &n);
s = n / 10000;
b = s % 100;
if (b == 21)
f = s + 80;
else if (b == 1 || b == 11)
f = s + 10;
else if (b == 20) {
f = s + 1;
}
h = f;
j = h % 10;
h = h / 10;
k = h % 10;
h = h / 10;
l = h % 10;
h = h / 10;
printf("%d%d%d%d%d", f, j, k, l, h);
for (q = s; q <= 4444 ; q++) {
w = q;
e = w % 10;
w = w / 10;
r = w % 10;
w = w / 10;
t = w % 10;
w = w / 10;
if (w == r && e == t && w != r) {
printf("%d%d%d%d%d", q, e, r, t, w);
break;
}
}
return 0;
}