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

int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    string A,B,SUM;
    cin >> A >> B >> SUM;
    int n = A.size();
    ll dp0 = 0, dp1 = 0, res = 0;
    for(int i = n - 1; i >= 0; i--){
        int a = A[i] - '0';
        int b = B[i] - '0';
        int c = SUM[i] - '0';
        ll temp0 = 0, temp1 = 0;
        int s = a + b;
        if(s % 10 == c){
            if(s < 10) temp0++;
            else temp1++;
        }
        if(dp0 > 0){
            if(s % 10 == c){
                if(s < 10) temp0 += dp0;
                else temp1 += dp0;
            }
        }
        int s1 = a + b + 1;
        if(dp1 > 0){
            if(s1 % 10 == c){
                if(s1 < 10) temp0 += dp1;
                else temp1 += dp1;
            }
        }
        dp0 = temp0;
        dp1 = temp1;
        res += dp0;
    }
    cout << res;
}