#include <stdio.h>
#include <stdint.h>

#define N (15)
uint64_t Triangle[N][N] = {
    {75},
    {95, 64},
    {17, 47, 82},
    {18, 35, 87, 10},
    {20, 4, 82, 47, 65},
    {19, 1, 23, 75, 3, 34},
    {88, 2, 77, 73, 7, 63, 67},
    {99, 65, 4, 28, 6, 16, 70, 92},
    {41, 41, 26, 56, 83, 40, 80, 70, 33},
    {41, 48, 72, 33, 47, 32, 37, 16, 94, 29},
    {53, 71, 44, 65, 25, 43, 91, 52, 97, 51, 14},
    {70, 11, 33, 28, 77, 73, 17, 78, 39, 68, 17, 57},
    {91, 71, 52, 38, 17, 14, 91, 43, 58, 50, 27, 29, 48},
    {63, 66, 4, 68, 89, 53, 67, 30, 73, 16, 69, 87, 40, 31},
    { 4, 62, 98, 27, 23, 9, 70, 98, 73, 93, 38, 53, 60, 4, 23}
};

void Solve()
{
    for (int64_t i = N - 2; i >= 0; i--)
    {
        for (uint64_t j = 0; j <= i; j++)
        {
            uint64_t l = Triangle[i + 1][j];
            uint64_t r = Triangle[i + 1][j + 1];
            Triangle[i][j] += (l > r ? l : r);
        }
    }

    fprintf(stdout, "%lu\n", Triangle[0][0]);
}

int main()
{
    Solve();
    return 0;
}