#include <iostream>

int main() {
    std::ios::sync_with_stdio(false);
    std::cin.tie(0);
    
    long long int n, day = 0, sameCount = 0;
    std::cin >> n;
    for(int i=2015; i<(n-2014)%2800+2015; ++i){
        day+=365;
        if(i%400==0){
            ++day;
        }else if(i%4==0 && i%100!=0){
            ++day;
        }
        if(day%7==0){
            ++sameCount;
        }
    }
    std::cout << (n-2014)/2800*399 + sameCount << "\n";
    

    return 0;
}