Date to day name conversion

#include <bits/stdc++.h>
#define _ ios_base:sync_with_stdio(0);cin.tie(0);
using namespace std;
/*** typedef ***/
#define MEMSET_INF 127
#define MEMSET_HALF_INF 63
#define stream istringstream
#define rep(i,n) for(__typeof(n) i=0; i<(n); i++)
#define repl(i,n) for(__typeof(n) i=1; i<=(n); i++)
#define FOR(i,a,b) for(__typeof(b) i=(a); i<=(b); i++)
#define INF (1<<30)
#define PI acos(-1.0)
#define pb push_back
#define ppb pop_back
#define all(x) x.begin(),x.end()
#define mem(x,y) memset(x,y,sizeof(x))
#define memsp(x) mem(x,MEMSET_INF)
#define memdp(x) mem(x,-1)
#define memca(x) mem(x,0)
#define eps 1e-9
#define pii pair<int,int>
#define pmp make_pair
#define ft first
#define sd second
#define vi vector<int>
#define vpii vector<pii>
#define si set<int>
#define msi map<string , int >
#define mis map<int , string >
typedef long long i64;
typedef unsigned long long ui64;
/** function **/
#define SDi(x) sf("%d",&x)
#define SDl(x) sf("%lld",&x)
#define SDs(x) sf("%s",x)
#define SD2(x,y) sf("%d%d",&x,&y)
#define SD3(x,y,z) sf("%d%d%d",&x,&y,&z)
#define pf printf
#define print(x) pf("%d ", x)
#define println(x) pf("%d\n", x)
#define sf scanf
#define READ(f) freopen(f, "r", stdin)
#define WRITE(f) freopen(f, "w", stdout)


bool isLeapYear(int year) {
    return (year % 4 == 0);
}
map <int, int> monthTable;
bool isFriday (string date) {
    int year = atoi( (date.substr(0, 4)).c_str() );
    int lastTwo = atoi((date.substr (2, 2)).c_str());
    int century = atoi((date.substr (0, 2)).c_str());
    int month = atoi( (date.substr(5, 2)).c_str() );
    int day = atoi( (date.substr(8, 2)).c_str() );
    int monthTableValue;
    if (isLeapYear(lastTwo) && (month == 1 || month == 2)) {
        monthTableValue = monthTable[month] - 1;
    } else {
        monthTableValue = monthTable[month];
    }
    int c = 0;
    switch (century % 4) {
    case 0:
        c = 6;
        break;
    case 1:
        c = 4;
        break;
    case 2:
        c = 2;
        break;
    case 3:
        c = 0;
        break;
    default:
        break;
    }
    int days = ( day + monthTableValue + lastTwo + int (floor(lastTwo / 4)) +  c) % 7;
    if (days == 5 && day == 13)
        return true;
    return false;
}
int main() {
#ifndef ONLINE_JUDGE
    READ("input.txt");
#endif
    monthTable[1] = 0;
    monthTable[2] = 3;
    monthTable[3] = 3;
    monthTable[4] = 6;
    monthTable[5] = 1;
    monthTable[6] = 4;
    monthTable[7] = 6;
    monthTable[8] = 2;
    monthTable[9] = 5;
    monthTable[10] = 0;
    monthTable[11] = 3;
    monthTable[12] = 5;
    int tcase;
    string date;
    SDi(tcase);
    int total = 0;
    while(tcase--) {
        cin >> date;
        total += isFriday(date);
    }
    println(total);
    return 0;
}