# include<iostream> # include<cstdio> # include<iomanip> # include<cmath> using namespace std; int main(){ int n=0,x=0,b=0,sum=0,i=0,tinm=0,cout0=0; while(n+x+b<30) { tinm++; sum=0; if(n<=10){ sum=1; n++; } if(x<=10&&tinm%2==0){ sum=1; x++; } if(b<=10&&tinm%4==0){ sum=1; b++; } if(sum){cout0++;} } cout<<cout0; return 0; }