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#include<bits/stdc++.h>
#define VAR(i,n) __typeof(n) i = (n)
#define loop(i,j,s) for(int i=j;i<s;i++)
#define loopback(i,j,s) for(int i=j;i>=s;i--)
#define foreach(i,c) for(VAR(i,(c).begin());i!=(c).end();i++)
#define pln( x ) cout << x << "\n"
#define ps( x ) cout << x << " "
#define entr cout << "\n"
#define pcnt(i) __builtin_popcount(i)
#define ll long long
#define pb push_back
#define mp make_pair
#define ff first
#define ss second
#define SIZE(c) (c).size()
#define ALL(c) (c).begin(), (c).end()
using namespace std;
typedef vector<int> VI;
typedef pair<int, int> PII;
typedef vector<vector<int> > VVI;
const int INFTY=20000000;
const int MAX=1000100;
const int MOD=10000000;

void coutTab(int* tab,int n){
	loop(i,0,n){
		cout<<tab[i]<<" ";
	}
	cout<<"\n";
}

template<class T> void coutVec(vector<T> tab){
	for(T t : tab){
		cout<<t<<" ";
	}
	cout<<"\n";
}
//------------------------------------------
int a[MAX],b[MAX],c[MAX];
int main(){
	ios_base::sync_with_stdio(0);
	string A,B,C;
	cin>>A>>B>>C;
	int n=SIZE(A);
	loop(i,0,n){
		a[n-i-1]=A[i]-'0';
		b[n-i-1]=B[i]-'0';
		c[n-i-1]=C[i]-'0';
	}
	ll cnt0=0,cnt1=0,res=0;
	loop(k,0,n){
		cnt0++;
		ll new_cnt0=0,new_cnt1=0;
		int s0=a[k]+b[k];
		if(s0%10==c[k]){
			if(s0/10==0){ res+=cnt0; new_cnt0+=cnt0; }
			else new_cnt1+=cnt0;
		}
		int s1=s0+1;
		if(s1%10==c[k]){
			if(s1/10==0){ res+=cnt1; new_cnt0+=cnt1; }
			else new_cnt1+=cnt1;
		}
		cnt0=new_cnt0;
		cnt1=new_cnt1;
	}
	pln(res);
}