def interQuartile(values, freqs):
    # Print your answer to 1 decimal place within this function
    arr=[]
    for i in range(len(values)):
        ans = [values[i]] * freqs[i]  
        arr.extend(ans)  
    arr.sort()
    
    n = len(arr)
    mid = n//2
    
    if n%2 == 0:
        L = arr[:mid]
        U = arr[mid:]
    else:
        L = arr[:mid]
        U = arr[mid+1:]
    
    Q1 = median(L)
    Q3 = median(U)
    
    answer = Q3-Q1
    print(f"{answer:.1f}")
    
def median(a):
    n = len(a)
    mid = n//2
    if n % 2 == 0:
        median = (a[mid] + a[~mid]) / 2
    else:
        median = a[mid]
        
    return round(median)