#include <bits/stdc++.h> using namespace std; #define all(c) (c).begin(),(c).end() #define rrep(i,n) for(int i=(int)(n)-1;i>=0;i--) #define REP(i,m,n) for(int i=(int)(m);i<(int)(n);i++) #define rep(i,n) REP(i,0,n) #define iter(c) __typeof((c).begin()) #define tr(it,c) for(iter(c) it=(c).begin();it!=(c).end();it++) #define pb(a) push_back(a) #define pr(a) cout<<(a)<<endl #define PR(a,b) cout<<(a)<<" "<<(b)<<endl #define R cin>> #define F first #define S second #define ll long long bool check(int n,int m,int x,int y){return x>=0&&x<n&&y>=0&&y<m;} const ll MAX=1000000007,MAXL=1LL<<60,dx[4]={-1,0,1,0},dy[4]={0,1,0,-1}; typedef pair<int,int> P; int d[13]={0,31,28,31,30,31,30,31,31,30,31,30,31}; int main() { int ans=0; REP(i,1,13) { REP(j,1,d[i]+1) { int x=j,y=0; while(x) { y+=x%10; x/=10; } if(i==y) ans++; } } cout << ans << endl; return 0; }