#include <stdio.h>
#include <ctype.h>


int main()
{
    int total, coin, game, reminder, reminder2;
    char ans;


    do{
    printf("Enter a coin [10p,20p,50p]: \n");
    scanf("%d", &coin);


    if(coin!=10 && coin!=20 && coin!=50 && coin!=0){
    printf("invalid coin \n");

    }else


    total=total+coin;



 }while(coin!=0);



    printf("Total is: %d \n", total);




    while(total>=50){
    total-=50;
    game+=3;
    }
    while(total>=20){
        game++;
        total-=20;
    }





    printf("you have: %d games", game);




    return 0;

}