panic: interface conversion: interface {} is int, not int64

goroutine 1 [running]:
main.(*maxHeap).Push(0x18?, {0xdc180?, 0x12a360?})
	/home/ubuntu/codeforces/0-999/0-99/30-39/35/verifierE.go:43 +0xc0
container/heap.Push({0x12b2a8, 0x40000a60c0}, {0xdc180?, 0x12a360?})
	/usr/local/go/src/container/heap/heap.go:52 +0x3c
main.envelope({0x40000ba000, 0x2, 0xfd9f2?})
	/home/ubuntu/codeforces/0-999/0-99/30-39/35/verifierE.go:72 +0x1d4
main.generateCase(0x40000a0e68)
	/home/ubuntu/codeforces/0-999/0-99/30-39/35/verifierE.go:137 +0x224
main.main()
	/home/ubuntu/codeforces/0-999/0-99/30-39/35/verifierE.go:156 +0x1f0
exit status 2