#include<bits/stdc++.h>
using namespace std;
int main(){
	int a,b,c;cin>>a>>b>>c;
	cout<<(a+b)/c;
	return 0;
} 

#include <iostream>
using namespace std;
int main()
{
    int a,b,c;
    cin>>a>>b>>c;
    cout<<(a+b)/c<<endl;
    return 0;
}

#include<bits/stdc++.h>
using namespace std;
long long q,w,e,r,t,y,u,i,o,p,d,f,g,h,j,k,l,z,x,c,v,b,n,m;
char s;
long long a[100000],as[100000],asd[100000];
int main()
{
	cin>>x>>y>>z;
	cout<<(x+y)/z;
    return 0;
}

#include<bits/stdc++.h>
using namespace std;
long long q,w,e,r,t,y,u,i,o,p,d,f,g,h,j,k,l,z,x,c,v,b,n,m;
char s;
long long a[100000],as[100000],asd[100000];
int main()
{
	cin>>x>>y>>z;
	cout<<(x+y)/z;
    return 0;
}