Guessing game with buffer overflow

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <string.h>

int counter = 0;
char username[16];

void win() {
    printf("You win this round %s\n", username);
    counter++;
}

void loose() {
    printf("You lose, better luck next time %s!\n\n", username);
    counter = 0;
}


int calculate(char *text, int input1, int input2, int input3, int number1, int number2, int number3) {

    char name[16];
    strcpy(name, text);

    if (number1 == input1 && number2 == input2 && number3 == input3)
        return 0;
    else
        return 1;

}

int main(int argc, char ** argv) {

    int number1, number2, number3;
    int input1 = 0, input2 = 0, input3 = 0;

    if(argc < 2){
        printf("Please pass at least one argument with your program.\nOtherwise you won't be able to exploit it ;)\n");
        exit(0);
    }


    printf("Please enter your name!\n");
    fgets(username, sizeof(username), stdin);
    username[strcspn(username, "\n")] = '\0';


    while(counter < 5){
        printf("Can you beat this minigame?\n\nEnter three numbers between 0-10 if you guess all correct you win, otherwise you lose!\n");

        printf("Enter your first guess!\n");
        scanf("%d", &input1);
        printf("Enter your second guess!\n");
        scanf("%d", &input2);
        printf("Enter your third guess!\n");
        scanf("%d", &input3);

        srand(time(NULL));

        number1 = rand() % 10;
        number2 = rand() % 10;
        number3 = rand() % 10;


        if(calculate(argv[1], input1, input2, input3, number1, number2, number3) == 0)
            win();
        else
            loose();

    }

    printf("Against all odds you beat the game!\nCongratulations %s", username);

    exit(0);
    return 0;
}