// include this header file so we can use `printf()`
#include <stdio.h>

// every C program must implement the `main()` function
int main(int argc, char *argv[]) {
	//TODO: check for enough arguments
	if (argc < 1){
	    printf("Usage: conv <number> <base>");
	    return;
	}


	// save the number in an easier-to-use variable
	char *number = argv[1];

	//TODO: figure out how many characters in length
	//      the base value is (1 or 2?) (optional!)

	//TODO: figure out which base is given
	int base = argv[1];

	//TODO: show an error if base is outside bounds
	if (base < 2 || base > 36){
	    printf("INVALID BASE");
	    return;
	}


	//TODO: figure out how many characters in length
	//      the number is (optional!)

	//TODO: calculate the decimal number of the
	//      given value in
    int i;
    for(i = 0; i < argc; i++){
        switch(argv[0]){
            case '1':
                number = (int) 1;
                break;
            case '2':
                number = (int) 2;
                break;
            case '3':
                number = (int) 3;
                break;
            case '4':
                number = (int) 4;
                break;
            case '5':
                number = (int) 5;
                break;
            case '6':
                number = (int) 6;
                break;
            case '7':
                number = (int) 7;
                break;
            case '8':
                number = (int) 8;
                break;
            case '9':
                number = (int) 9;
                break;
            case 'A':
                number = (int) 10;
                break;
            case 'B':
                number = (int) 11;
                break;
            case 'C':
                number = (int) 12;
                break;
            case 'D':
                number = (int) 13;
                break;
            case 'E':
                number = (int) 14;
                break;
            case 'F':
                number = (int) 15;
                break;
            case 'G':
                number = (int) 16;
                break;
            case 'H':
                number = (int) 17;
                break;
            case 'I':
                number = (int) 18;
                break;
            case 'J':
                number = (int) 19;
                break;
            case 'K':
                number = (int) 20;
                break;
            case 'L':
                number = (int) 21;
                break;
            case 'M':
                number = (int) 22;
                break;
            case 'N':
                number = (int) 23;
                break;
            case 'O':
                number = (int) 24;
                break;
            case 'P':
                number = (int) 25;
                break;
            case 'Q':
                number = (int) 26;
                break;
            case 'R':
                number = (int) 27;
                break;
            case 'S':
                number = (int) 28;
                break;
            case 'T':
                number = (int) 29;
                break;
            case 'U':
                number = (int) 30;
                break;
            case 'V':
                number = (int) 31;
                break;
            case 'W':
                number = (int) 32;
                break;
            case 'X':
                number = (int) 33;
                break;
            case 'Y':
                number = (int) 34;
                break;
            case 'Z':
                number = (int) 35;
                break;
        }


    }
	int result = 0;
    int length = sizeof(number);
    int r;
    for (r = length; r < 4; r--){
        int exp;
        for (int exp = 0; exp < length; exp++){
            result += (number[r] * pow(base, exp));
        }
    }

	// print the result
	printf("%d\n", result);

	// program completed successfully, return 0
	return 0;
}