#include<iostream> #include<cstdio> //scanf()\printf() #include<cstring> #include<cmath> //sqrt()\pow()\abs()\ceil()\floor()\max()\min() using namespace std; int main(){ int n,x,s,g,s,b,q; for(int i=1;i<=n;i++){ cin>>x; g=x%10; s=x/10%10; b=x/100%10; q=/1000; if(g-s-b-q>0) s++; } cout<<s; return 0; }