#include<stdio.h>
int xx(int n,int m,int k) 
{
    int a;
    if(n==1)
    {
        a=k;
    }
    else
    {        
        a=xx(n-1,m,k)+m;
    }
    return a;
}
int main()
{
    int n,m,k;
    while(scanf("%d %d %d",&n,&m,&k)!=EOF)
    {
        printf("%d\n",xx(n,m,k));
    }
    return 0;
}

 

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