19 lines
310 B
Python
19 lines
310 B
Python
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import sys
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s, n = [int(d) for d in input().split(' ')]
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dragons = []
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for _ in range(n):
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dragons.append([int(d) for d in input().split(' ')])
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dragons = sorted(dragons, key=lambda x: x[0])
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for i in dragons:
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if s > i[0]:
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s += i[1]
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else:
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print("NO")
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sys.exit()
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print("YES")
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