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

const int MAXN = 1e6+5;
int a[MAXN],b[MAXN],c[MAXN],dp[MAXN],w[MAXN]; //a+b=c

int32_t main(){
    ios_base::sync_with_stdio(0);
    string s1,s2,s3; cin >> s1 >> s2 >> s3;
    for(int i=0;i<s1.size();i++) a[i+1] = s1[i]-'0';
    for(int i=0;i<s2.size();i++) b[i+1] = s2[i]-'0';
    for(int i=0;i<s3.size();i++) c[i+1] = s3[i]-'0';
    int n = s1.size();

    int ans=0;
    for(int i=1;i<=n;i++){
        int val = a[i]+b[i], carry = 0;
        for(int j=i;j>0;j--){
            val = a[j] + b[j] + carry;
            if(val%10 != c[j]) break;
            if(val<10){
                dp[i] += dp[j-1] + 1;
                break;
            }
            else{
                carry=1;
                if(j==1) c[1] = -1;
            }

        }
        ans += dp[i];
    }
    cout << ans << '\n';
}