1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
#include <bits/stdc++.h>

using namespace std;

#define ll long long

#define rng(i,a,b) for(int i=int(a);i<int(b);i++)
#define rep(i,b) rng(i,0,b)

typedef vector<int> vi;
typedef vector<vi> vvi;
typedef vector<vvi> vvvi;

typedef vector<ll> vl;
typedef vector<vl> vvl;
typedef vector<vvl> vvvl;

typedef pair<int,int> ii;

template<class t> using vc=vector<t>;
template<class t> using vvc=vc<vc<t>>;

const int MOD = 998244353;

ll read(){
    ll i;
    cin>>i;
    return i;
}

vi readvi(int n,int off=0,int shift=0){
    vi v(n+shift);
    rep(i,shift)v[i]=0;
    rep(i,n)v[i+shift]=read()+off;
    return v;
}

void YesNo(bool condition, bool do_exit=true) {
    if (condition)
        cout << "Yes" << endl;
    else
        cout << "No" << endl;
    if (do_exit)
        exit(0);
}

int main(void ) {
    ios::sync_with_stdio(false);
    cin.tie(NULL);

    vi a[3];

    rep(i,3) {
        string s;
        cin >> s;
        for (char ch : s)
            a[i].push_back(ch-'0');
    }

    int n = a[0].size();

    int num_begins = 0;

    ll res = 0;
    int carry = 0;
    for(int i=n-1; i>=0; --i) {
        int new_carry = 0;

        if (carry == 1 and (a[0][i] + a[1][i]) % 10 == a[2][i]) {
            num_begins = 1;
            new_carry = (a[0][i] + a[1][i]) / 10;
            if (new_carry == 0)
                res += 1;
        }
        else
        if ((a[0][i] + a[1][i] + carry) % 10 == a[2][i]) {
            new_carry = (a[0][i] + a[1][i] + carry) / 10;
            if (carry == 0)
                num_begins += 1;
            if (new_carry == 0)
                // można skończyć
                    res += num_begins;
        }
        else {
            num_begins = 0;
        }

        carry = new_carry;
    }

    cout << res << endl;

    return 0;
}