Mine

#include <stdio.h>

int main(int argc, char *argv[])
{
    int x, y;
    x= (int) argv[1];
    y = x*5;
    //printf("%d\n",argc);
    //for (x=0; x<argc; x++)
    //    printf("%s\n",argv[x]);
    printf("%d",  y);
    return 0;
}