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#include <bits/stdc++.h>
using namespace std;


int main() {
	string a,b;
	int n,d;
	unsigned long long w=0;
	bool z,m;
	cin>>n;
	cin>>b;
	
	for(int i=1; i<n; i++){
		z=0;
		m=0;
		d=0;
		for(int i=b.length()-1; i>0; i--){
				if(b[i]=='9'){
					d++;
				}else{
					break;
				}
			}
		cin>>a;
		if(a.length()<=b.length()){
			for(int i=0; i<a.length(); i++){
				if(a[i]>b[i]){
					z=1;
					break;
				}else if(a[i]<b[i]){
					m=1;
					break;
				}
			}
			while(b.length()>a.length()+1+d&&!z&&!m){
				a+=b[a.length()];
				w++;
			}
			if(b.length()==a.length()+1+d&&!z&&!m){
				a+=char(int(b[a.length()])+1);
				w++;
				z=1;
			}
			while(b.length()>a.length()){
				a+='0';
				w++;
			}
			if(!z){
				a+='0';
				w++;
			}
		}
		b=a;
	}
	cout<<w;
}