# include<iostream> # include<cstdio> using namespace std; int main(){ int y,t,m,s=0; for(y=1;y<=1000;y++){ for(t=1;t<=20;t++){ if(t==m){ s+=1; } } for(m=1;m<=30;m++){ if(t==m){ s+=1; } } } cout<<s/2; return 0; }