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#include<bits/stdc++.h>
#define ll long long
#define pb push_back
#define fi first
#define se second
#define lb lower_bound
using namespace std;
int main(){
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	string a,b,c;
	cin>>a>>b>>c;
	for(int i=0;i<a.size();i++){
		a[i]-='0';b[i]-='0';c[i]-='0';
	}
	int dl=a.size();ll wynik=0;
	vector<ll>dp(dl+1),dp1(dl+1);
	for(int i=dl-1;i>-1;i--){
		int s=a[i]+b[i];
		if(s%10==c[i]){
			if(s<10)
			dp[i]=dp[i+1]+1;
			else
			dp1[i]=dp[i+1]+1;
		}
		s++;
		if(s%10==c[i]){
			if(s<10)
			dp[i]=dp1[i+1];
			else
			dp1[i]=dp1[i+1];
		}
		wynik+=dp[i];
	}
	cout<<wynik;
	return 0;
}