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#include "bits/stdc++.h"
using namespace std;
using ll = long long;

int n;
string a, b, c;
ll ans, dp[2][2];

int main(){
    ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    cin >> a >> b >> c;
    n = a.size();
    for(int i = n-1; ~i; --i){
        dp[0][0]++;
        dp[0][1] = dp[1][1] = 0;
        int x = a[i] - '0' + b[i] - '0';
        int y = x+1;
        if(x%10 == (c[i] - '0')) dp[x/10][1] += dp[0][0];
        if(y%10 == (c[i] - '0')) dp[y/10][1] += dp[1][0];
        dp[0][0] = dp[0][1];
        dp[1][0] = dp[1][1];
        ans += dp[0][0];
    }
    cout << ans << '\n';
}