C :

#include<stdio.h>
int main()
{
	int n,k,a,sn;
	scanf("%d%d%d",&n,&k,&a);
	sn=a+(n-1)*k;
	printf("%d\n",sn);
	return 0;
}

C++ :

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

Pascal :

var
  n,k,a:longint;
begin
  readln(n,k,a);
  a:=a+(n-1)*k;
  writeln(a);
end.

Java :

import java.util.Scanner;

public class Main{
   private static Scanner s = new Scanner(System.in) ;
   
   public static void main(String[] args) {
	 int n = s.nextInt() ;
	 int k = s.nextInt() ;
	 int a = s.nextInt() ;
	 
	 if(n<=100&&k<=100&&a<=100){
		 System.out.println(a+(n-1)*k);
	 }
   }
}

Python :

n, k, a = [int(i) for i in raw_input().split()]
print a + (n - 1) * k