#include <iostream> using namespace std ; int main (){ int n,a,b,c,d,man; cin>>n>>a>>b>>c>>d; for(int i = 1; i<=n; i++){ a=n%10; b=n%100/10; c=n/100%10; d=n%1000; if(a-b-c-d){ man++; } } cout<<man; return 0; }