Tarifa

Tarifa.py

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+"""
+Pero has negotiated a Very Good data plan with his internet provider. The
+provider will let Pero use up X megabytes to surf the internet per month. Each
+megabyte that he doesn’t spend in that month gets transferred to the next month
+and can still be spent. Of course, Pero can only spend the megabytes he
+actually has.
+
+If we know how much megabytes Pero has spent in each of the first N months of
+using the plan, determine how many megabytes Pero will have available in the
+N+1 month of using the plan.
+
+Input
+The first line of input contains the integer X (1≤X≤100). The second line of
+input contains the integer N (1≤N≤100). Each of the following N lines contains
+an integer Pi (0≤Pi≤10000), the number of megabytes spent in each of the first
+N months of using the plan. Numbers Pi will be such that Pero will never use
+more megabytes than he actually has.
+
+Output
+The first and only line of output must contain the required value from the
+task.
+"""
+
+import sys
+
+x = int(sys.stdin.readline())
+n = int(sys.stdin.readline())
+
+p = (n + 1) * x
+for _ in range(n):
+    p -= int(sys.stdin.readline())
+
+print(p)