#include<iostream> #include<cstdio> #include<bits/stdc++.h> using namespace std; long long int a,b,c; char j,k; long long int d,e,f; char o,p; long long int sum,ans; int main(){ cin>>a>>j>>b>>k>>c; cin>>d>>o>>e>>p>>f; cin>>ans; sum+=(d-a)*3600*ans; sum+=(e-b)*60*ans; sum+=(f-c)*ans; cout<<sum; return 0; }