Why does Kattis return this as invalid?

Question

https://open.kattis.com/problems/pot

Pot

The teacher has sent an e-mail to her students with the following task: “Write a program that will determine and output the value of X if given the statement:

X = number₁^pow₁ + number₂^pow₂ + … + number_N^pow_N

and it holds that number₁, number₂ to number_N are integers, and pow₁, pow₂ to pow_N are one-digit integers.” Unfortunately, when the teacher downloaded the task to her computer, the text formatting was lost so the task transformed into a sum of N integers:

X = P1 + P2 + … + PN

For example, without text formatting, the original task in the form of X = 21² + 125³ became a task in the form of X = 212 + 1253. Help the teacher by writing a program that will, for given N integers from P₁ to P_N determine and output the value of X from the original task.

Input:

The first line of input contains the integer N (1 ≤ N ≤ 10), the number of the addends from the task. Each of the following N lines contains the integer P_i (10 ≤ P_i ≤ 9999, i = 1 … N) from the task.

Output:

The first and only line of output must contain the value of X (X ≤ 1000000000) from the original task.

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I recently just started coding in C++ and was told Kattis was a good website to start practicing on. I have started to freshen up on the basics for my upcoming CS 2 class in the fall and I am confused why my answer is not getting accepted. Any answers would be greatly appreciated!

#include <iostream>
#include <cmath>

using namespace std;

int main()
{
    int nums, number, total, temp;
    cin >> nums;

    for (int i = 0; i < nums; i++) {
        cin >> number;
        temp = number % 10;
        number = number / 10;
        total = total + pow(number, temp);
    }

    cout << total;
}