Dsa
Math
Medium
Arithmetic Series Sum
Write a program that calculates the sum of the first n terms of an arithmetic series defined by a starting term and a difference. The sum can be computed using the formula: S_n = n/2 * (2a + (n-1)d), where a is the first term, d is the difference, and n is the number of terms.
Input:
Three integers a, d, n on a single line, separated by spaces.
Output:
The sum of the first n terms of the series.
Example:
Input:
1 2 5
Output:
25
Key concepts
seriessummationarithmetic
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