Buggy python submission (verdict: Time Limit Exceeded):
n, m = map(int, input().split())
ab = [list(map(int, input().split())) for _ in range(n)]

import heapq
import collections

a_all = []
for i in range(n):
    a_all.append(ab[i][0])

key_all = list(set(a_all))
key_all.sort()

d = dict()
for k in key_all:
    d[k] = []

for i in range(n):
    a = ab[i][0]
    b = ab[i][1]
    d[a].append(b)



ans = 0
l = []
import bisect

for i in range(1, m+1):
    if key_all != []:
        if i == key_all[0]:
            for v in d[i]:
                bisect.insort(l, v)

            key_all = key_all[1:]

    # print(l)

    if l != []:
        ans += l[-1]
        l.pop()
print(ans)


Fixed submission:
n, m = map(int, input().split())
ab = [list(map(int, input().split())) for _ in range(n)]

import heapq
import collections

a_all = []
for i in range(n):
    a_all.append(ab[i][0])

key_all = list(set(a_all))
key_all.sort()

d = dict()
for k in key_all:
    d[k] = []

for i in range(n):
    a = ab[i][0]
    b = ab[i][1]
    d[a].append(b)

ans = 0
l = []
for i in range(1, m+1):
    if key_all != []:
        if i == key_all[0]:
            for v in d[i]:
                heapq.heappush(l, -1 * v)

            heapq.heappop(key_all)

    if l != []:
        ans += heapq.heappop(l) * -1

print(ans)

Buggy python submission (verdict: Time Limit Exceeded):
n, m = map(int, input().split())
ab = [list(map(int, input().split())) for _ in range(n)]

import heapq
import collections

a_all = []
for i in range(n):
    a_all.append(ab[i][0])

key_all = list(set(a_all))
key_all.sort()

d = dict()
for k in key_all:
    d[k] = []

for i in range(n):
    a = ab[i][0]
    b = ab[i][1]
    d[a].append(b)



ans = 0
l = []
import bisect

for i in range(1, m+1):
    if i in key_all:
        for v in d[i]:
            bisect.insort(l, v)

    # print(l)

    if l != []:
        ans += l[-1]
        l.pop()
print(ans)


Fixed submission:
n, m = map(int, input().split())
ab = [list(map(int, input().split())) for _ in range(n)]

import heapq
import collections

a_all = []
for i in range(n):
    a_all.append(ab[i][0])

key_all = list(set(a_all))
key_all.sort()

d = dict()
for k in key_all:
    d[k] = []

for i in range(n):
    a = ab[i][0]
    b = ab[i][1]
    d[a].append(b)

ans = 0
l = []
for i in range(1, m+1):
    if key_all != []:
        if i == key_all[0]:
            for v in d[i]:
                heapq.heappush(l, -1 * v)

            heapq.heappop(key_all)

    if l != []:
        ans += heapq.heappop(l) * -1

print(ans)

Buggy python submission (verdict: Time Limit Exceeded):
n, m = map(int, input().split())
ab = [list(map(int, input().split())) for _ in range(n)]

import heapq

d = dict()
key_all = []
for i in range(n):
    a = ab[i][0]
    b = ab[i][1]

    if a not in key_all:
        d[a] = [b]
        heapq.heappush(key_all, a)
    else:
        d[a].append(b)

ans = 0
l = []

for i in range(1, m+1):
    if key_all != []:
        if i == key_all[0]:
            for v in d[i]:
                heapq.heappush(l, -1 * v)

            heapq.heappop(key_all)

    if l != []:
        ans += heapq.heappop(l) * -1

print(ans)


Fixed submission:
n, m = map(int, input().split())
ab = [list(map(int, input().split())) for _ in range(n)]

import heapq
import collections

a_all = []
for i in range(n):
    a_all.append(ab[i][0])

key_all = list(set(a_all))
key_all.sort()

d = dict()
for k in key_all:
    d[k] = []

for i in range(n):
    a = ab[i][0]
    b = ab[i][1]
    d[a].append(b)

ans = 0
l = []
for i in range(1, m+1):
    if key_all != []:
        if i == key_all[0]:
            for v in d[i]:
                heapq.heappush(l, -1 * v)

            heapq.heappop(key_all)

    if l != []:
        ans += heapq.heappop(l) * -1

print(ans)

Buggy python submission (verdict: Time Limit Exceeded):
n, m = map(int, input().split())
ab = [list(map(int, input().split())) for _ in range(n)]

import bisect
import heapq

d = dict()
key_all = []
for i in range(n):
    a = ab[i][0]
    b = ab[i][1]

    if a not in key_all:
        d[a] = [b]
        heapq.heappush(key_all, a)
    else:
        d[a].append(b)


ans = 0
l = []

for i in range(1, m+1):
    if key_all != []:
        if i == key_all[0]:
            for v in d[i]:
                heapq.heappush(l, -1 * v)

            heapq.heappop(key_all)

    # print(l)

    if l != []:
        ans += heapq.heappop(l) * -1

    # print(ans)

print(ans)


Fixed submission:
n, m = map(int, input().split())
ab = [list(map(int, input().split())) for _ in range(n)]

import heapq
import collections

a_all = []
for i in range(n):
    a_all.append(ab[i][0])

key_all = list(set(a_all))
key_all.sort()

d = dict()
for k in key_all:
    d[k] = []

for i in range(n):
    a = ab[i][0]
    b = ab[i][1]
    d[a].append(b)

ans = 0
l = []
for i in range(1, m+1):
    if key_all != []:
        if i == key_all[0]:
            for v in d[i]:
                heapq.heappush(l, -1 * v)

            heapq.heappop(key_all)

    if l != []:
        ans += heapq.heappop(l) * -1

print(ans)

Buggy python submission (verdict: Time Limit Exceeded):
n, m = map(int, input().split())
ab = [list(map(int, input().split())) for _ in range(n)]

d = dict()
key_all = []
for i in range(n):
    a = ab[i][0]
    b = ab[i][1]

    if a not in key_all:
        d[a] = [b]
        key_all.append(a)
    else:
        d[a].append(b)

key_all.sort()

ans = 0
l = []
import bisect

mm = key_all[-1]
for i in range(1, min(mm, m) + 1):
    if i == key_all[0]:
        for v in d[i]:
            bisect.insort(l, v)

        key_all.pop(0)

    if l != []:
        ans += l.pop()

if m > mm:
    for i in range(mm + 1, m + 1):
        if l != []:
            ans += l.pop()


print(ans)


Fixed submission:
n, m = map(int, input().split())
ab = [list(map(int, input().split())) for _ in range(n)]

import heapq
import collections

a_all = []
for i in range(n):
    a_all.append(ab[i][0])

key_all = list(set(a_all))
key_all.sort()

d = dict()
for k in key_all:
    d[k] = []

for i in range(n):
    a = ab[i][0]
    b = ab[i][1]
    d[a].append(b)

ans = 0
l = []
for i in range(1, m+1):
    if key_all != []:
        if i == key_all[0]:
            for v in d[i]:
                heapq.heappush(l, -1 * v)

            heapq.heappop(key_all)

    if l != []:
        ans += heapq.heappop(l) * -1

print(ans)

Buggy python submission (verdict: Time Limit Exceeded):
n, m = map(int, input().split())
ab = [list(map(int, input().split())) for _ in range(n)]

d = dict()
key_all = []
for i in range(n):
    a = ab[i][0]
    b = ab[i][1]

    if a not in key_all:
        d[a] = [b]
        key_all.append(a)
    else:
        d[a].append(b)

key_all.sort()

ans = 0
l = []
import bisect

for i in range(1, m+1):
    if key_all != []:
        if i == key_all[0]:
            for v in d[i]:
                bisect.insort(l, v)

            key_all.pop(0)

    # print(l)

    if l != []:
        ans += l.pop()

print(ans)


Fixed submission:
n, m = map(int, input().split())
ab = [list(map(int, input().split())) for _ in range(n)]

import heapq
import collections

a_all = []
for i in range(n):
    a_all.append(ab[i][0])

key_all = list(set(a_all))
key_all.sort()

d = dict()
for k in key_all:
    d[k] = []

for i in range(n):
    a = ab[i][0]
    b = ab[i][1]
    d[a].append(b)

ans = 0
l = []
for i in range(1, m+1):
    if key_all != []:
        if i == key_all[0]:
            for v in d[i]:
                heapq.heappush(l, -1 * v)

            heapq.heappop(key_all)

    if l != []:
        ans += heapq.heappop(l) * -1

print(ans)

Buggy python submission (verdict: Time Limit Exceeded):
n, m = map(int, input().split())
ab = [list(map(int, input().split())) for _ in range(n)]

d = dict()
key_all = []
for i in range(n):
    a = ab[i][0]
    b = ab[i][1]

    if a not in key_all:
        d[a] = [b]
        key_all.append(a)
    else:
        d[a].append(b)

key_all.sort()

ans = 0
l = []
import bisect

for i in range(1, m+1):
    if key_all != []:
        if i == key_all[0]:
            for v in d[i]:
                bisect.insort(l, v)

            key_all.pop(0)

    # print(l)

    if l != []:
        ans += l[-1]
        l.pop()
print(ans)


Fixed submission:
n, m = map(int, input().split())
ab = [list(map(int, input().split())) for _ in range(n)]

import heapq
import collections

a_all = []
for i in range(n):
    a_all.append(ab[i][0])

key_all = list(set(a_all))
key_all.sort()

d = dict()
for k in key_all:
    d[k] = []

for i in range(n):
    a = ab[i][0]
    b = ab[i][1]
    d[a].append(b)

ans = 0
l = []
for i in range(1, m+1):
    if key_all != []:
        if i == key_all[0]:
            for v in d[i]:
                heapq.heappush(l, -1 * v)

            heapq.heappop(key_all)

    if l != []:
        ans += heapq.heappop(l) * -1

print(ans)

Buggy python submission (verdict: Time Limit Exceeded):
n, m = map(int, input().split())
ab = [list(map(int, input().split())) for _ in range(n)]

d = dict()
key_all = []
for i in range(n):
    a = ab[i][0]
    b = ab[i][1]

    if a not in key_all:
        d[a] = [b]
        key_all.append(a)
    else:
        d[a].append(b)

key_all.sort()

ans = 0
l = []
import bisect

for i in range(1, m+1):
    if key_all != []:
        if i == key_all[0]:
            for v in d[i]:
                bisect.insort(l, v)

            key_all = key_all[1:]

    # print(l)

    if l != []:
        ans += l[-1]
        l.pop()
print(ans)


Fixed submission:
n, m = map(int, input().split())
ab = [list(map(int, input().split())) for _ in range(n)]

import heapq
import collections

a_all = []
for i in range(n):
    a_all.append(ab[i][0])

key_all = list(set(a_all))
key_all.sort()

d = dict()
for k in key_all:
    d[k] = []

for i in range(n):
    a = ab[i][0]
    b = ab[i][1]
    d[a].append(b)

ans = 0
l = []
for i in range(1, m+1):
    if key_all != []:
        if i == key_all[0]:
            for v in d[i]:
                heapq.heappush(l, -1 * v)

            heapq.heappop(key_all)

    if l != []:
        ans += heapq.heappop(l) * -1

print(ans)

Buggy python submission (verdict: Runtime Error):
n, m = map(int, input().split())
ab = [list(map(int, input().split())) for _ in range(n)]

d = dict()
for i in range(1, m+1):
    d[i] = []

for i in range(n):
    a = ab[i][0]
    b = ab[i][1]

    d[a].append(b)


ans = 0
l = []
import bisect

for i in range(1, m+1):
    for v in d[i]:
        bisect.insort(l, v)

    # print(l)

    if l != []:
        ans += l[-1]
        l.pop()
print(ans)


Fixed submission:
n, m = map(int, input().split())
ab = [list(map(int, input().split())) for _ in range(n)]

import heapq
import collections

a_all = []
for i in range(n):
    a_all.append(ab[i][0])

key_all = list(set(a_all))
key_all.sort()

d = dict()
for k in key_all:
    d[k] = []

for i in range(n):
    a = ab[i][0]
    b = ab[i][1]
    d[a].append(b)

ans = 0
l = []
for i in range(1, m+1):
    if key_all != []:
        if i == key_all[0]:
            for v in d[i]:
                heapq.heappush(l, -1 * v)

            heapq.heappop(key_all)

    if l != []:
        ans += heapq.heappop(l) * -1

print(ans)

Buggy python submission (verdict: Time Limit Exceeded):
n, m = map(int, input().split())
ab = [list(map(int, input().split())) for _ in range(n)]

d = dict()
for i in range(n):
    a = ab[i][0]
    b = ab[i][1]

    if a not in d.keys():
        d[a] = [b]
    else:
        d[a].append(b)

key_all = list(d.keys())
key_all.sort()

ans = 0
l = []
import bisect

for i in range(1, m+1):
    if i in key_all:
        for v in d[i]:
            bisect.insort(l, v)

    # print(l)

    if l != []:
        ans += l[-1]
        l.pop()
print(ans)


Fixed submission:
n, m = map(int, input().split())
ab = [list(map(int, input().split())) for _ in range(n)]

import heapq
import collections

a_all = []
for i in range(n):
    a_all.append(ab[i][0])

key_all = list(set(a_all))
key_all.sort()

d = dict()
for k in key_all:
    d[k] = []

for i in range(n):
    a = ab[i][0]
    b = ab[i][1]
    d[a].append(b)

ans = 0
l = []
for i in range(1, m+1):
    if key_all != []:
        if i == key_all[0]:
            for v in d[i]:
                heapq.heappush(l, -1 * v)

            heapq.heappop(key_all)

    if l != []:
        ans += heapq.heappop(l) * -1

print(ans)