#include<iostream> // cin\cout\endl #include<cstdio> //scanf()\printf() #include<cstring> // strcpy()\strcat()\strcmp()\strlen()\memset() #include<cmath> //sqrt()\pow()\abs()\ceil()\floor()\max()\min() using namespace std; int main(){ int g,s,b,q,n,a=4,p,m; cin>>n; for(int i=1;i<=a;i++){ g=n%10; s=n%100/10; b=n%1000/100; q=n/100; p=g-s-b-q; if(p>0){ m+1; } }cout<<m; return 0; }