def arrayManipulation(n, queries):
    arr = [0]*(n+1)
    for (start, end, value) in queries:
        arr[start-1] += value
        arr[end] -= value

    itsum = 0
    mnum = 0
    for i in range(n):
        itsum += arr[i]
        if mnum < itsum:
            mnum = itsum
         
    return mnum