#include<bits/stdc++.h>
using namespace std;
int s,f,m,s1,f1,m1,n,a,a1,sdd;
int main(){
cin>>s>>f>>m;
cin>>s1>>f1>>m1;
cin>>n;
f=60*f;
s=s*60*60;
s1=s1*60*60;
f1=f1*60;
a=f+s+m;
a1=f1+s1+m1;
sdd=(a1-a)*n;
cout<<sdd;
}