help?!

#include <bits/stdc++.h>
using namespace std;
int main()
{
	string s;
	cin>>s;
    int len=s.size(),b=0,k=1;
    //cout<<b<<"\n";
    for(int i=len-1;i>=0;i--){
        if(i==0 and s[i]=='0')
        {
            continue;
        }
        int g=s[i]-'0';
        //cout<<g<<" ";
        b=b+g*k;
        //cout<<b<<" ";
        k=k*10;
        //cout<<"\n";
        
    }
    //cout<<b<<endl;
	int a=b-1234567+1;
	cout<<a;
}