#include<iostream> #include<cstdio> //scanf()\printf() #include<cstring> #include<cmath> //sqrt()\pow()\abs()\ceil()\floor()\max()\min() using namespace std; int main(){ int j=1,y=1,i=1,sum=0; while(i<=1000){ if(j==20) j=0; if(y==30) y=0; if(j==y) sum+=1; j++; y++; i++; } cout<<sum; return 0; }