#include <bits/stdc++.h>
using namespace std;
#define int long long
int sumdigit(int x) {
int s = 0;
while(x > 0) {
s += x % 10;
x /= 10;
}
return s;
}
signed main() {
int n;
cin >> n;
int ans = 0;
for(int i = 1; i <= n; i ++) {
if(sumdigit(i) == 10) ans ++;
}
cout << ans;
}
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