# include <math.h>
# include <stdio.h>
# include <algorithm>

using namespace std;

int a,b,c,x,y;

int main()
{
    scanf("%d %d %d",&a,&b,&c);

    for(int i=1;i<10001;i++)
    {
        x=0;
        y=0;

        for(int j=1;j<=(int)sqrt((double)i)+1;j++)
        if(i%j==0)
        x++;

        if(i-c>0)
        {
            for(int j=1;j<=(int)sqrt((double)(i-c))+1;j++)
            if(i%j==0)
            y++;
        }

        if(b==x && a==y)
        {printf("%d",i);getchar();getchar();return 0;}
    }

    printf("0");system("Pause");
}