#include<iostream> using namespace std; int main(){ int qx=0,xm=0,xy=0,time=0,count=0; bool flag=false; while(qx+xm+xy<30){ flag=false; if(time%2==0 && xm<10){ xm=xm+1; flag=true; } if(time%4==0 && xy<10){ xy=xy+1; flag=true; } if(qx<10){ qx=qx+1; flag=true; } if(flag){ count = count+1; } time++; } cout<<count<<endl; return 0; }