Add new file

2-7

+#include <stdio.h>
+int main()
+{
+    int n = 0;
+    scanf("%d", &n);
+    int a = 0;
+    int b = 0;
+    int c = 0;
+    int d = 0;
+    while (n >= 20) {
+        a = a + 1;
+        n = n - 20;
+    }
+    while (n >= 10) {
+        b = b + 1;
+        n = n - 10;
+    }
+    while (n >= 5) {
+        c = c + 1;
+        n = n - 5;
+    }
+    d = n;
+    printf("$20 bills: %d\n", a);
+    printf("$10 bills: %d\n", b);
+    printf("$5 bills: %d\n", c);
+    printf("$1 bills: %d", d);
+    return 0;
+}
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