#include <iostream>
#include <cstdio>
#include <cmath>
#include <cstdlib>
#include <cstring>
#include <vector>
#include <ctime>
#include <deque>
#include <queue>
#include <algorithm>
#include <map>
#include <cmath>
using namespace std;
#define X first
#define Y second
#define pb push_back
#define mp make_pair
#define all(a) (a).begin(), (a).end()
#define fillchar(a, x) memset(a, x, sizeof(a))
typedef pair< int , int > pii;
typedef long long ll;
typedef unsigned long long ull;
#ifndef ONLINE_JUDGE
void RI(vector< int >&a, int n){a.resize(n); for ( int i=0;i<n;i++) scanf ( "%d" ,&a[i]);}
void RI(){} void RI( int &X){ scanf ( "%d" ,&X);} template < typename ...R>
void RI( int &f,R&...r){RI(f);RI(r...);} void RI( int *p, int *q){ int d=p<q?1:-1;
while (p!=q){ scanf ( "%d" ,p);p+=d;}} void print(){cout<<endl;} template < typename T>
void print( const T t){cout<<t<<endl;} template < typename F, typename ...R>
void print( const F f, const R...r){cout<<f<< ", " ;print(r...);} template < typename T>
void print(T*p, T*q){ int d=p<q?1:-1; while (p!=q){cout<<*p<< ", " ;p+=d;}cout<<endl;}
#endif
template < typename T> bool umax(T&a, const T&b){ return b<=a? false :(a=b, true );}
template < typename T> bool umin(T&a, const T&b){ return b>=a? false :(a=b, true );}
template < typename T>
void V2A(T a[], const vector<T>&b){ for ( int i=0;i<b.size();i++)a[i]=b[i];}
template < typename T>
void A2V(vector<T>&a, const T b[]){ for ( int i=0;i<a.size();i++)a[i]=b[i];}
const double PI = acos (-1.0);
const int INF = 1e9 + 7;
/* -------------------------------------------------------------------------------- */
int a[12345], b[12345];
int main() {
#ifndef ONLINE_JUDGE
freopen ( "in.txt" , "r" , stdin);
//freopen("out.txt", "w", stdout);
#endif // ONLINE_JUDGE
int n1, n2, n3;
while (cin >> n1 >> n2 >> n3, n1 + n2 + n3 > 0) {
fillchar(a, 0);
fillchar(b, 0);
for ( int i = 0; i <= n1; i ++) {
for ( int j = 0; j <= 2 * n2; j += 2) {
a[i + j] ++;
}
}
int sz = n1 + 2 * n2;
for ( int i = 0; i <= sz; i ++) {
for ( int j = 0; j <= 5 * n3; j += 5) {
b[i + j] += a[i];
}
}
for ( int i = 0; ; i ++) {
if (!b[i]) {
cout << i << endl;
break ;
}
}
}
return 0;
}
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