#include <bits/stdc++.h>

#define INi(x) scanf("%d", &x)
#define INii(x, y) scanf("%d %d", &x, &y)
#define INi(x) scanf("%d", &x)
#define INs(s) scanf(" %s", s)
#define Oi(x) printf("%d\n", x)
#define OCSi(c, x) printf("Case %d: %d\n", c, x)
#define Os(s) printf("%s\n", s)
#define OCSi(c, s) printf("Case %s: %d\n", c, s)
#define LLI long long int

using namespace std;

int main()
{
    int p, q, y;
    INii(p, q);
    INi(y);
    Oi(52*(5*p+2*q)*y);

    return 0;
}